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Nexus 7 - freezing

Started by David Wean · · Last activity · 9 posts · 328 views

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Cycling Equipment
Published
7 February 2007
Last activity
9 February 2007
Original author
David Wean
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  1. I've got a so-called commuter bike (Giant Cypress, won through the
    Biketown promotion last summer) that has a Nexus 7 hub. A few weeks
    ago I rode it in the rain. Ever since then whenever the temperature
    is below 32 something freezes, and I can with difficulty shift up
    (higher cable tension) but not down. The cable is continuous from the
    grip shifter through the ferrule just before it attaches to the hub.
    I have not yet disassembled the cable to clean/dry/lube the cable and
    housing (take it off the hub, unscrew the doo-dad that the is attached
    to the cable, pull off all the housing, clean and lube and hope I
    reinstall correctly, etc.)

    Anyone had this problem - it it common with this hub? Am I right that
    it's likely the cable, or is there something about the hub that would
    cause this? For years I had a Sachs Super 7 on a Broadway Bike and
    though it froze like this once or twice, it cleared itself up within a
    day or so.

    I told my wife I was posting to this group to ask why the bike was
    freezing. She says that "it's darn cold".

    David Wean, Roslindale, MA

  2. David Wean said:

    I've got a so-called commuter bike (Giant Cypress, won through the
    Biketown promotion last summer) that has a Nexus 7 hub. A few weeks
    ago I rode it in the rain.
    Ever since then whenever the temperature
    is below 32 something freezes, and I can with difficulty shift up
    (higher cable tension) but not down. The cable is continuous from the
    grip shifter through the ferrule just before it attaches to the hub.
    I have not yet disassembled the cable to clean/dry/lube the cable and
    housing (take it off the hub, unscrew the doo-dad that the is attached
    to the cable, pull off all the housing, clean and lube and hope I
    reinstall correctly, etc.)

    Anyone had this problem - it it common with this hub? Am I right that
    it's likely the cable.

    It's the cable. The labyrinth seals on the hub itself thumb their nose
    at cold and wet. I've had the same thing happen with brake cables.
    Displace the moisture with your choice of appropriate lube. It's a
    great hub, you'll get years of enjoyment out of it, I'm sure.

  3. landotter said:
    David Wean said:

    I've got a so-called commuter bike (Giant Cypress, won through the
    Biketown promotion last summer) that has a Nexus 7 hub. A few weeks
    ago I rode it in the rain.
    Ever since then whenever the temperature
    is below 32 something freezes, and I can with difficulty shift up
    (higher cable tension) but not down. The cable is continuous from the
    grip shifter through the ferrule just before it attaches to the hub.
    I have not yet disassembled the cable to clean/dry/lube the cable and
    housing (take it off the hub, unscrew the doo-dad that the is attached
    to the cable, pull off all the housing, clean and lube and hope I
    reinstall correctly, etc.)

    Quoted message said:

    Anyone had this problem - it it common with this hub? Am I right that
    it's likely the cable.

    It's the cable. The labyrinth seals on the hub itself thumb their nose
    at cold and wet. I've had the same thing happen with brake cables.
    Displace the moisture with your choice of appropriate lube. It's a
    great hub, you'll get years of enjoyment out of it, I'm sure.

    Good advice. I've been using a Nexus 7 for two winters now, and I've
    never had a shifting issue even down to -25C. Also, in order to
    reduce chances of the cable getting frozen or gummed up I use as
    little housing as I can get away with. The hub came to me secondhand
    without any fittings (save for the hub's own housing stop), so I used
    some old Sturmey Archer frame fittings to run the cable.

    http://drumbent.com/winterbike.html

    Mark

  4. Quoted message said:

    I've been using a Nexus 7 for two winters now, and I've
    never had a shifting issue even down to -25C. Also, in order to
    reduce chances of the cable getting frozen or gummed up I use as
    little housing as I can get away with. The hub came to me secondhand
    without any fittings (save for the hub's own housing stop), so I used
    some old Sturmey Archer frame fittings to run the cable.

    http://drumbent.com/winterbike.html

    Ha, that's a bruiser of a winter bike. Good stuff!

    I did see that ya made a note about cleaning that shocking chain, but
    might I recommend a KMC heavy duty one. They're nickel plate, and the
    side plates and pins are fatter than usual. $10, and require little
    love. I ran one on my Nexus 7 during the winter and it was one less
    thing to worry about.

  5. On 6 Feb 2007 20:00:40 -0800, "David Wean" <[email hidden]>
    wrote:

    [---]

    Quoted message said:

    Anyone had this problem - it it common with this hub?

    I have the same problem on my shopping/railway station bike, which has
    the same hub. Whenever the temperature drops below freezing, it won't
    shift down below third. Four to seven work fine in both directions.

  6. Andrew Price said:

    On 6 Feb 2007 20:00:40 -0800, "David Wean" <[email hidden]>
    wrote:

    [---]

    Quoted message said:

    Anyone had this problem - it it common with this hub?

    I have the same problem on my shopping/railway station bike, which has
    the same hub. Whenever the temperature drops below freezing, it won't
    shift down below third. Four to seven work fine in both directions.

    Check the adjustment of the cable and lube. I've ridden a Nexus- 7
    down to around 10F and it shifted just fine, but dang was I cold. :-P

  7. landotter said:
    Quoted message said:

    I've been using a Nexus 7 for two winters now, and I've
    never had a shifting issue even down to -25C. Also, in order to
    reduce chances of the cable getting frozen or gummed up I use as
    little housing as I can get away with. The hub came to me secondhand
    without any fittings (save for the hub's own housing stop), so I used
    some old Sturmey Archer frame fittings to run the cable.

    Quoted message said:

    http://drumbent.com/winterbike.html

    Ha, that's a bruiser of a winter bike. Good stuff!

    I did see that ya made a note about cleaning that shocking chain, but
    might I recommend a KMC heavy duty one. They're nickel plate, and the
    side plates and pins are fatter than usual. $10, and require little
    love. I ran one on my Nexus 7 during the winter and it was one less
    thing to worry about.

    Yeah, I could do that, but since I volunteer at a bike recycling co-op
    we have lots of old but still useable chains. I toss one on and ride
    it (and clean and lube it) until it starts getting too creaky. Then it
    goes into our metal recycling bin and I put another old one on. I
    don't care how the chain looks as long as it still flexes freely and
    does what it should do.

    One thing I have been trying out recently is one of those extra-thick
    innertubes on the rear tire to minimize flat potential. But it adds a
    bit too much rolling mass to the bike (the old adage is 1 lb. on the
    wheel is like 4 on the frame), so it's coming off.

    Also, I have removed the roller brake and installed cantis, because I
    was getting a bit paranoid about getting a flat back there and having
    to undo not only the wheel nuts and shifter cable, but also the brake
    arm and brake cable. Sure, the cables have QRs, but the arm doesn't,
    and none of it would be fun to wrestle with covered in grunge at
    -20C. And yes, one can patch a flat with the wheel still on the bike,
    but patches don't always stick in cold weather, and things like broken
    valves still mean changing the tube (for which I always keep a spare
    on hand).

    Mark
    http://drumbent.blogspot.com/

  8. Quoted message said:
    landotter said:

    On Feb 7, 12:53 pm, [email hidden] wrote:

    Quoted message said:
    Quoted message said:

    I've been using a Nexus 7 for two winters now, and I've
    never had a shifting issue even down to -25C. Also, in order to
    reduce chances of the cable getting frozen or gummed up I use as
    little housing as I can get away with. The hub came to me secondhand
    without any fittings (save for the hub's own housing stop), so I used
    some old Sturmey Archer frame fittings to run the cable.

    Quoted message said:
    Quoted message said:

    http://drumbent.com/winterbike.html

    Quoted message said:

    Ha, that's a bruiser of a winter bike. Good stuff!

    Quoted message said:

    I did see that ya made a note about cleaning that shocking chain, but
    might I recommend a KMC heavy duty one. They're nickel plate, and the
    side plates and pins are fatter than usual. $10, and require little
    love. I ran one on my Nexus 7 during the winter and it was one less
    thing to worry about.

    Yeah, I could do that, but since I volunteer at a bike recycling co-op
    we have lots of old but still useable chains. I toss one on and ride
    it (and clean and lube it) until it starts getting too creaky. Then it
    goes into our metal recycling bin and I put another old one on. I
    don't care how the chain looks as long as it still flexes freely and
    does what it should do.

    Mostly there with ya, but I still like shiny chains. :-P Too much of a
    PITA to try to deal with old ones. Exception being the lovely original
    chain on my '76 Raleigh Woman's Sports.

    Quoted message said:


    One thing I have been trying out recently is one of those extra-thick
    innertubes on the rear tire to minimize flat potential. But it adds a
    bit too much rolling mass to the bike (the old adage is 1 lb. on the
    wheel is like 4 on the frame), so it's coming off.

    Those are awful. Tried them.Hated them. I've been quite impressed with
    the IRC Tandem tires on my day to day ride--I ride it over anything,
    like the crow flies, and zero flats in a thousand miles , but they're
    unfortunately expensive in the context of a bike recycling thing.

    Quoted message said:

    Also, I have removed the roller brake and installed cantis, because I
    was getting a bit paranoid about getting a flat back there and having
    to undo not only the wheel nuts and shifter cable, but also the brake
    arm and brake cable. Sure, the cables have QRs, but the arm doesn't,
    and none of it would be fun to wrestle with covered in grunge at
    -20C. And yes, one can patch a flat with the wheel still on the bike,
    but patches don't always stick in cold weather, and things like broken
    valves still mean changing the tube (for which I always keep a spare
    on hand).

    I never, in the 30K that my Nexi bike did, had a flat that needed a
    wheel removal. Two flats. Patches. Tough tires. Even so, I never found
    a wheel removal to be that traumatic. Disengaging the shifter cable is
    far more traumatic than the brake cable. Cantis are gonna be better
    than the roller brake, but you give up that Toyota reliability on the
    back end.


  9. Quoted message said:
    Quoted message said:

    Yeah, I could do that, but since I volunteer at a bike recycling co-op
    we have lots of old but still useable chains. I toss one on and ride
    it (and clean and lube it) until it starts getting too creaky. Then it
    goes into our metal recycling bin and I put another old one on. I
    don't care how the chain looks as long as it still flexes freely and
    does what it should do.

    Mostly there with ya, but I still like shiny chains. :-P Too much of a
    PITA to try to deal with old ones. Exception being the lovely original
    chain on my '76 Raleigh Woman's Sports.

    Quoted message said:

    One thing I have been trying out recently is one of those extra-thick
    innertubes on the rear tire to minimize flat potential. But it adds a
    bit too much rolling mass to the bike (the old adage is 1 lb. on the
    wheel is like 4 on the frame), so it's coming off.

    Those are awful. Tried them.Hated them. I've been quite impressed with
    the IRC Tandem tires on my day to day ride--I ride it over anything,
    like the crow flies, and zero flats in a thousand miles , but they're
    unfortunately expensive in the context of a bike recycling thing.

    Sometimes new stuff is indeed worth it. On my cargo trike I'm running
    Schwalbe Big Apples (406 size), and they are the perfect tire for that
    application, since they can be run at low psi for shock absorption
    without the sidewall deforming.

    Hmm, I could look into the Schwalbe Marathon with its fat kevlar
    strip, but for winter riding I want a tire a more agressive tread.

    Quoted message said:


    Quoted message said:

    Also, I have removed the roller brake and installed cantis, because I
    was getting a bit paranoid about getting a flat back there and having
    to undo not only the wheel nuts and shifter cable, but also the brake
    arm and brake cable. Sure, the cables have QRs, but the arm doesn't,
    and none of it would be fun to wrestle with covered in grunge at
    -20C. And yes, one can patch a flat with the wheel still on the bike,
    but patches don't always stick in cold weather, and things like broken
    valves still mean changing the tube (for which I always keep a spare
    on hand).

    I never, in the 30K that my Nexi bike did, had a flat that needed a
    wheel removal. Two flats. Patches.

    Is this in winter riding? I 've had patches not hold when put on in
    below-freezing weather.

    Quoted message said:

    Tough tires. Even so, I never found
    a wheel removal to be that traumatic. Disengaging the shifter cable is
    far more traumatic than the brake cable.

    Yes, the shift cable is a pain. I understand Shimano's concept of
    making the mech. inboard of the frame to protect it, and in warmer
    weather it's not a big deal to fuss with. But on a dark, cold
    winter's night I don't like the idea of trying to get that all hooked
    back together. I use this hub because it came to me really cheap, as
    the left bearings were shot and had to be replaced, and I also had the
    hub's innards inspected and re-lubed by my old bike shop boss (who has
    taken lots of these apart). If I was buying new I'd spend the extra
    bucks and get the Sachs hub, as the clickbox concept works just fine
    and makes wheel removal a snap (as long as it doesn't have the coaster
    brake!).

    Quoted message said:

    Cantis are gonna be better
    than the roller brake, but you give up that Toyota reliability on the
    back end.

    Quite true. The roller brake is prefectly consistent no matter what
    kind of slushy grunge is buiding up on the wheel, but it's also
    consistently not very strong. And I use the rear brake far more in
    winter than in summer to keep control of the front end in slippery
    conditions, and now that I have the cantis back on it feels much
    better (as does removing that 2 lb. brake!).

    Mark

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