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Climbing gears

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Published
14 October 2007
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19 October 2007
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graham
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  1. Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket. Can I cut the cost by using a 105 or perhaps a lower spec (I
    doubt if I'll use the kit for more than one or two of these adventures).
    Will my current Ultegra front mech shift a triple. What rear mech can I get
    to shift a 12-34 and if not Ultegra will it be compatible with my Ultegra
    STIs etc

  2. You will need a new BB and a new front derailleur, and, of course, you
    will need a rear derailleur which can wrap enough chain.

    Either you should go whole hog - get a Campy triple setup nice and
    ecomonical!!! - and use a 12-21 for your regular riding,
    or perhaps you could use something like a Ritchey octalink compact
    (50-34) and a 12-32 which should allow you to keep the rest of the
    stuff intact...

    JG

  3. I think the cheapest solution is an inexpensive Shimano MTB rear
    deraileur and 12-34 cassette... if you are sure this will be a low
    enough gear. Don't get a Ritchey crank... they break.

  4. graham said:

    Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket. Can I cut the cost by using a 105 or perhaps a lower spec (I
    doubt if I'll use the kit for more than one or two of these adventures).
    Will my current Ultegra front mech shift a triple. What rear mech can I get
    to shift a 12-34 and if not Ultegra will it be compatible with my Ultegra
    STIs etc

    Cheap and good? Easy. Every cassette is easily disassembled.Just punch
    out the rivets that are there as a convenience. Build your own with
    the cogs you need. Are you willing to descend, pushing a 53-12 ? If
    not, give up the 12, and maybe the 21 to make room for 28t and 34t
    cogs. The Ultegra will certainly handle the 28. a 34? You'll need to
    try it. Or spend $60 on a long cage Ultegra.

    Stay Shimano and STI will work. You're just going to sacrifice some
    speed in the shifts. And of course you want to lengthen the chain to
    not risk breaking it.

  5. graham said:

    Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket. Can I cut the cost by using a 105 or perhaps a lower spec (I
    doubt if I'll use the kit for more than one or two of these adventures).
    Will my current Ultegra front mech shift a triple. What rear mech can I get
    to shift a 12-34 and if not Ultegra will it be compatible with my Ultegra
    STIs etc

    Any Shimano mountain bike rear derailer will index with your shifters.
    All but a couple of the cheapest models will handle a 34t cog. You can
    get a Deore mech for $16 at Nashbar, and it'll work about as well as
    anything.

    In front, the fact that you have an Octalink setup now complicates
    matters. I think Ultegra was Octalink V1, and cranks for that interface
    are getting scarce. All I see in the QBP catalog is a Ritchey compact
    double and a Dura-Ace triple (spendy). If neither of those fit your
    needs and you're not willing to scour ebay, you'll need a new bottom
    bracket to go with any new crank. If you go with a triple you'll also
    need a new front derailer and possibly a new front shifter.

    Converting to a triple is probably the most expensive solution, but it
    would also allow you to run somewhat closer spacing in back and still
    get the same low gear.

  6. graham said:

    Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    Either of those options would require you to get a new rear derailleur,
    since they require more capacity (difference between largest-largest and
    smallest-smallest combinations, in teeth) than your current derailleur
    is likely to have.

    Quoted message said:


    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket.

    Probably not. The positioning will have to be different to properly
    line up with the cassette, and different cranks use different-sized
    bottom brackets for a number of reasons. But bottom brackets are not
    expensive.

    Can I cut the cost by using a 105 or perhaps a lower spec (I

    Quoted message said:

    doubt if I'll use the kit for more than one or two of these adventures).

    Sure, and since there is nothing wrong with 105, you won't be
    compromising anything.

    Quoted message said:

    Will my current Ultegra front mech shift a triple.

    Check. Loosen the cable; does it allow two shifts, or only one? Most
    are OK, but some Shimano ones are double-only.

    --

    David L. Johnson

    Let's be straight here. If we find something we can't understand we
    like to call it something you can't understand, or indeed even
    pronounce.
    -- Douglas Adams

  7. "graham" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Just starting to plan for doing the La Marmotte in France next year -
    174km taking in the col du Glandon, col du Galiber and finishing with the
    climb up to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with
    a 53/39 octalink chainset. My lowest geared cassette is a 12-27 giving a
    bottom gear of 37.7. Having studied the race profile I am thinking about
    taking something a bit lower just to be on the safe side. Alpe d'Huez with
    160km (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down
    to 29 with my 12-27 or sticking with the 53/39 and going for a 12-34
    cassette to give 29.9.

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my
    current bottom bracket. Can I cut the cost by using a 105 or perhaps a
    lower spec (I doubt if I'll use the kit for more than one or two of these
    adventures). Will my current Ultegra front mech shift a triple. What rear
    mech can I get to shift a 12-34 and if not Ultegra will it be compatible
    with my Ultegra STIs etc

    You will need a new BB and a new front derailleur, and, of course, you
    will need a rear derailleur which can wrap enough chain.
    JG
    .......................................................................................................
    I think the cheapest solution is an inexpensive Shimano MTB rear
    deraileur and 12-34 cassette... if you are sure this will be a low
    enough gear. Don't get a Ritchey crank... they break.
    Ron
    ......................................................................................................
    The Ultegra will certainly handle the 28. a 34? You'll need to
    try it. Or spend $60 on a long cage Ultegra.

    Stay Shimano and STI will work. You're just going to sacrifice some
    speed in the shifts. And of course you want to lengthen the chain to
    not risk breaking it.
    Harry
    ..................................................................................................................
    Any Shimano mountain bike rear derailer will index with your shifters.
    All but a couple of the cheapest models will handle a 34t cog. You can
    get a Deore mech for $16 at Nashbar, and it'll work about as well as
    anything.
    Steve
    ...................................................................................................................

    Thanks guys. From what you have all said this looks like a new 12-34
    cassette and a new rear mech (plus a new chain of course). From the specs I
    have seen the long cage Ultegra says 27 teeth is the max. Can anyone from
    experience confirm whether or not a long cage Ultegra will handle a 34. If
    not then I would be happy to go with a Deore or even an XTR . Can I take it
    that a Deore or XTR 12-34 cassette would fit ok on my existing Ultegra hub.
    If it will and my Ultegra STI will shift it then this looks the way to go if
    a long cage Ultegra rear mech cannot reliably shift a 12-34.

    Graham.

  8. graham said:

    Thanks guys. From what you have all said this looks like a new 12-34
    cassette and a new rear mech (plus a new chain of course). From the specs I
    have seen the long cage Ultegra says 27 teeth is the max. Can anyone from
    experience confirm whether or not a long cage Ultegra will handle a 34.

    I don't have experience with Ultegra specifically, but the 105 rear
    derailer has similar geometry and whether it'll handle a 30t cog or not
    depends on the design of the derailer hanger. I wouldn't expect a 34t to
    work in any case.

    See <http://sheldonbrown.com/harris/derailers-rear.html>, especially
    "A note about range" and "A note about capacity".

  9. BTW a 39 x 34 gives a 31 inch gear...

    You are running into a generic problem with wide ranges on thick
    cassettes (I'll assume you are using a 9 speed?).

    With a standard 12-34, the "cross over" occurs at the 16t cog, so you
    are getting 11 unique gears. Your front shift is essentially a two
    step. If you went with a half step, say 11-34 and a 43 or 44 x 39
    (needs to be double checked...) you would gain 18 unique gears for a
    little off the top. But nobody needs that many gears in the low end,
    and the double shifts are a pain at the high end. So the front
    derailleur isn't doing much. You could even go with a single
    chainring...

    A compact addressed this by making the cross over a bit further. A
    triple addresses this by letting you use a tighter cassette over the
    same range. You don't necessarily get more gears, and you still have
    too many in the low end, but you do have a convenient shift pattern -
    chose you range on the crank, then fine tune on the cassette...

    JG

  10. "JG" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    BTW a 39 x 34 gives a 31 inch gear...

    You are running into a generic problem with wide ranges on thick
    cassettes (I'll assume you are using a 9 speed?).

    With a standard 12-34, the "cross over" occurs at the 16t cog, so you
    are getting 11 unique gears. Your front shift is essentially a two
    step. If you went with a half step, say 11-34 and a 43 or 44 x 39
    (needs to be double checked...) you would gain 18 unique gears for a
    little off the top. But nobody needs that many gears in the low end,
    and the double shifts are a pain at the high end. So the front
    derailleur isn't doing much. You could even go with a single
    chainring...

    A compact addressed this by making the cross over a bit further. A
    triple addresses this by letting you use a tighter cassette over the
    same range. You don't necessarily get more gears, and you still have
    too many in the low end, but you do have a convenient shift pattern -
    chose you range on the crank, then fine tune on the cassette...

    JG


    Faced with a similar problem, I switched from a compact (50/34) to a triple
    (52/42/30 set-up (Campagnolo) and a 12-26 cassette. I did not need to
    change the front changer nor the rear derailleur and the chain length was
    unaltered. Everything works fine as long as I don't use big/big or
    small/small cross-chaining combination (I wouldn't anyway). The only new
    parts required were the chainset and the bottom bracket.

  11. "JG" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    BTW a 39 x 34 gives a 31 inch gear...

    Not according to my calcs. My measured roll out is 2083mm. Sorry about the
    metric units but in gear inches that would be (2083/25.4x3.142) x (39 / 27)
    =37.7ins

    Graham.

  12. "graham" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:


    "JG" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    BTW a 39 x 34 gives a 31 inch gear...

    Not according to my calcs. My measured roll out is 2083mm. Sorry about the
    metric units but in gear inches that would be (2083/25.4x3.142) x (39 /
    27) =37.7ins

    Graham.

    Sorry, wrong example (2083/25.4x3.142) x (39 /34) =29.9

    Graham.

  13. Quoted message said:

    "JG" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    BTW a 39 x 34 gives a 31 inch gear...

    graham said:

    Not according to my calcs. My measured roll out is 2083mm. Sorry about the
    metric units but in gear inches that would be (2083/25.4x3.142) x (39 / 27)
    =37.7ins

    The metric world uses 'development' or distance traveled per crank rev.
    Less usefully, our 'gear inches' hark to the halcyon days of
    highwheelers and express the arcane 'equivalent Ordinary wheel'
    diameter. 39/34x27 is indeed 31 inches. Or 30.9 for sticklers.
    --
    Andrew Muzi
    www.yellowjersey.org
    Open every day since 1 April, 1971

  14. On Oct 14, 9:58 am, "[email hidden]" <[email hidden]>

    Quoted message said:
    graham said:

    Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    Quoted message said:

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    Quoted message said:

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket. Can I cut the cost by using a 105 or perhaps a lower spec (I
    doubt if I'll use the kit for more than one or two of these adventures).
    Will my current Ultegra front mech shift a triple. What rear mech can I get
    to shift a 12-34 and if not Ultegra will it be compatible with my Ultegra
    STIs etc

    Cheap and good? Easy. Every cassette is easily disassembled.Just punch
    out the rivets that are there as a convenience. Build your own with
    the cogs you need.

    <snip>

    You're behind the times, man. Many cassettes have a carrier for four
    or more sprockets. Pop out the rivets (if you can) and you have a
    bunch of little "chain rings." -- Jay Beattie.

  15. Graham who? said:

    Just starting to plan for doing the La Marmotte in France next year
    - 174km taking in the col du Glandon, col du Galibier and finishing
    with the climb up to Alpe d'Huez. Currently I have a Shimano
    Ultegra groupset with a 53/39 Octalink chainset. My lowest geared
    cassette is a 12-27 giving a bottom gear of 37.7. Having studied
    the race profile I am thinking about taking something a bit lower
    just to be on the safe side. Alpe d'Huez with 160km (100 miles) in
    my legs looks a bit daunting.

    Quoted message said:

    My initial thoughts are either a triple 52/42/30 which would get me
    down to 29 with my 12-27 or sticking with the 53/39 and going for a
    12-34 cassette to give 29.9.

    Quoted message said:

    I would welcome any advice on the most economical way to go. Mostly
    this comes down to what will work with what. E.g. will a triple
    fit on my current bottom bracket. Can I cut the cost by using a 105
    or perhaps a lower spec (I doubt if I'll use the kit for more than
    one or two of these adventures). Will my current Ultegra front mech
    shift a triple. What rear mech can I get to shift a 12-34 and if
    not Ultegra will it be compatible with my Ultegra STIs etc

    Gears on a bicycle ARE for climbing hills, rather than starting from a
    stop, and from what you say you have a fairly large span. My thoughts
    are, don't take everything along including the kitchen sink so you
    don't travel as a household moving van. There must be some
    challenging mountain roads in your area, so lay out some regular rides
    that include climbing and get in shape.

    I've been riding the Alps for 50 years and get along with far fewer
    gears with a lesser span than you list. At about 100+ miles per
    day over the hills you mention, it goes well for me. No manner of
    gearing will make up for good conditioning.

    http://www.trentobike.org/Countries/Europe/Tour_Reports/Tour_of_the_Alps/

    Jobst Brandt

  16. In article <[email hidden]>,

    Quoted message said:
    Graham who? said:

    Just starting to plan for doing the La Marmotte in France next year
    - 174km taking in the col du Glandon, col du Galibier and finishing
    with the climb up to Alpe d'Huez. Currently I have a Shimano
    Ultegra groupset with a 53/39 Octalink chainset. My lowest geared
    cassette is a 12-27 giving a bottom gear of 37.7. Having studied
    the race profile I am thinking about taking something a bit lower
    just to be on the safe side. Alpe d'Huez with 160km (100 miles) in
    my legs looks a bit daunting.

    Quoted message said:

    My initial thoughts are either a triple 52/42/30 which would get me
    down to 29 with my 12-27 or sticking with the 53/39 and going for a
    12-34 cassette to give 29.9.

    I ride a wider range of gears than Jobst and found that I did not need
    lower than 38 x 28 to get up the hills on the route of la Marmotte. My
    gearing was 48/38 x 12-28 8 speed. IIRC Jobst has described his gearing
    as 50/47 x 24-24 6 speed or something like that- gearing like Fausto
    Coppi used- so that gives you some notion of what's useable for this
    type of terrain. Jobst is a strong climber, I am a middling climber
    (6'4", ~210 lbs plus bike; Jobst is taller and lighter).

    Quoted message said:
    Quoted message said:

    I would welcome any advice on the most economical way to go.
    Mostly this comes down to what will work with what. E.g. will a
    triple fit on my current bottom bracket. Can I cut the cost by
    using a 105 or perhaps a lower spec (I doubt if I'll use the kit
    for more than one or two of these adventures). Will my current
    Ultegra front mech shift a triple. What rear mech can I get to
    shift a 12-34 and if not Ultegra will it be compatible with my
    Ultegra STIs etc

    The most economical approach is going to be to use what you have. ;-)
    After that, a compact double and a wide range cassette. With properly
    chosen gears and chain length you should be able to use your current
    derailleurs. My current setup on the bike I would use for la Marmotte
    has 46/34 X 12-28 8 speed. That would be more than low enough gears to
    get me over those hills.

    Quoted message said:

    Gears on a bicycle ARE for climbing hills, rather than starting from
    a stop, and from what you say you have a fairly large span. My
    thoughts are, don't take everything along including the kitchen sink
    so you don't travel as a household moving van. There must be some
    challenging mountain roads in your area, so lay out some regular
    rides that include climbing and get in shape.

    I've been riding the Alps for 50 years and get along with far fewer
    gears with a lesser span than you list. At about 100+ miles per day
    over the hills you mention, it goes well for me. No manner of
    gearing will make up for good conditioning.

    http://www.trentobike.org/Countries/Europe/Tour_Reports/Tour_of_the_Al
    ps/

    In an event like this you will not be carrying much gear- a rain jacket
    just in case (some years la Marmotte has had freezing temperatures over
    the highest passes and rain/snow is always a possibility), maybe some
    long finger gloves and possibly some knee warmers plus some snacks.
    IIRC there are food + water stops and such on the ride. When I rode
    this route in 2002, it was about 90F + in the valleys and 70-75F or so
    at the top of the Galibier- it was the heat that got me more than the
    climbing.

  17. "Tim McNamara" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In an event like this you will not be carrying much gear- a rain jacket
    just in case (some years la Marmotte has had freezing temperatures over
    the highest passes and rain/snow is always a possibility), maybe some
    long finger gloves and possibly some knee warmers plus some snacks.
    IIRC there are food + water stops and such on the ride. When I rode
    this route in 2002, it was about 90F + in the valleys and 70-75F or so
    at the top of the Galibier- it was the heat that got me more than the
    climbing.

    We were at the top of the Glandon this year around about Marmotte time. Ok,
    the Glandon was fine, but however many minutes later at the top of the Croix
    de Fer it was rodding it down and not pleasant at all. We had rather more
    clothes than all the lightweight types like you, yet I still got really cold
    (nasty shivering) on the descent.

    I did wonder about the people who didn't even appear to have the knee
    warmers you mention.

    cheers,
    clive

  18. In article <[email hidden]>,

    graham said:

    Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket. Can I cut the cost by using a 105 or perhaps a lower spec (I
    doubt if I'll use the kit for more than one or two of these adventures).
    Will my current Ultegra front mech shift a triple. What rear mech can I get
    to shift a 12-34 and if not Ultegra will it be compatible with my Ultegra
    STIs etc

    Compared to the ticket over the ocean and accommodations
    the price of an entirely new drive train is trivial.
    Put in a triple crank set. 52-39-26 and a 12-23 cassette.
    You will still have it when the tour becomes memories.

    --
    Michael Press

  19. In article
    <[email hidden].
    com>,

    Michael Press said:

    In article <[email hidden]>,

    graham said:

    Just starting to plan for doing the La Marmotte in France next year - 174km
    taking in the col du Glandon, col du Galiber and finishing with the climb up
    to Alpe d'Huez. Currently I have a Shimano Ultegra groupset with a 53/39
    octalink chainset. My lowest geared cassette is a 12-27 giving a bottom gear
    of 37.7. Having studied the race profile I am thinking about taking
    something a bit lower just to be on the safe side. Alpe d'Huez with 160km
    (100 miles) in my legs looks a bit daunting.

    My initial thoughts are either a triple 52/42/30 which would get me down to
    29 with my 12-27 or sticking with the 53/39 and going for a 12-34 cassette
    to give 29.9.

    I would welcome any advice on the most economical way to go. Mostly this
    comes down to what will work with what. E.g. will a triple fit on my current
    bottom bracket. Can I cut the cost by using a 105 or perhaps a lower spec (I
    doubt if I'll use the kit for more than one or two of these adventures).
    Will my current Ultegra front mech shift a triple. What rear mech can I get
    to shift a 12-34 and if not Ultegra will it be compatible with my Ultegra
    STIs etc

    Compared to the ticket over the ocean and accommodations
    the price of an entirely new drive train is trivial.
    Put in a triple crank set. 52-39-26 and a 12-23 cassette.
    You will still have it when the tour becomes memories.

    Whoops, I see you are starting from the UK.

    --
    Michael Press

  20. "Tim McNamara" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In article <[email hidden]>,

    Quoted message said:
    Graham who? said:

    Just starting to plan for doing the La Marmotte in France next year
    - 174km taking in the col du Glandon, col du Galibier and finishing
    with the climb up to Alpe d'Huez. Currently I have a Shimano
    Ultegra groupset with a 53/39 Octalink chainset. My lowest geared
    cassette is a 12-27 giving a bottom gear of 37.7. Having studied
    the race profile I am thinking about taking something a bit lower
    just to be on the safe side. Alpe d'Huez with 160km (100 miles) in
    my legs looks a bit daunting.

    Quoted message said:

    My initial thoughts are either a triple 52/42/30 which would get me
    down to 29 with my 12-27 or sticking with the 53/39 and going for a
    12-34 cassette to give 29.9.

    I ride a wider range of gears than Jobst and found that I did not need
    lower than 38 x 28 to get up the hills on the route of la Marmotte. My
    gearing was 48/38 x 12-28 8 speed. IIRC Jobst has described his gearing
    as 50/47 x 24-24 6 speed or something like that- gearing like Fausto
    Coppi used- so that gives you some notion of what's useable for this
    type of terrain. Jobst is a strong climber, I am a middling climber
    (6'4", ~210 lbs plus bike; Jobst is taller and lighter).

    Quoted message said:
    Quoted message said:

    I would welcome any advice on the most economical way to go.
    Mostly this comes down to what will work with what. E.g. will a
    triple fit on my current bottom bracket. Can I cut the cost by
    using a 105 or perhaps a lower spec (I doubt if I'll use the kit
    for more than one or two of these adventures). Will my current
    Ultegra front mech shift a triple. What rear mech can I get to
    shift a 12-34 and if not Ultegra will it be compatible with my
    Ultegra STIs etc

    The most economical approach is going to be to use what you have. ;-)
    After that, a compact double and a wide range cassette. With properly
    chosen gears and chain length you should be able to use your current
    derailleurs. My current setup on the bike I would use for la Marmotte
    has 46/34 X 12-28 8 speed. That would be more than low enough gears to
    get me over those hills.

    Quoted message said:

    Gears on a bicycle ARE for climbing hills, rather than starting from
    a stop, and from what you say you have a fairly large span. My
    thoughts are, don't take everything along including the kitchen sink
    so you don't travel as a household moving van. There must be some
    challenging mountain roads in your area, so lay out some regular
    rides that include climbing and get in shape.

    I've been riding the Alps for 50 years and get along with far fewer
    gears with a lesser span than you list. At about 100+ miles per day
    over the hills you mention, it goes well for me. No manner of
    gearing will make up for good conditioning.

    http://www.trentobike.org/Countries/Europe/Tour_Reports/Tour_of_the_Al
    ps/

    In an event like this you will not be carrying much gear- a rain jacket
    just in case (some years la Marmotte has had freezing temperatures over
    the highest passes and rain/snow is always a possibility), maybe some
    long finger gloves and possibly some knee warmers plus some snacks.
    IIRC there are food + water stops and such on the ride. When I rode
    this route in 2002, it was about 90F + in the valleys and 70-75F or so
    at the top of the Galibier- it was the heat that got me more than the
    climbing.

    But Jobst is a climbing animal.... The average rider can't compare him/her
    self with him. He's a maniac! ;-)

    Chas.

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