compact chainset on a budget

[[email protected]]

I have a tiagra 4400 double (39-52) with a cheap shimano 68X110 square
taper BB. I already have a crank puller and BB tool.

What would anyone suggest for switching to 34-48 for minimal cost?

Mirage Chainset Compact Alloy 2006 £39.95 (Parkers). Requires 111mm
BB. Is it square taper, would 110 be close enough would my crank puller
fit it?

STRONGLIGHT Impact Compact £58 (Spa). Needs a 107 mm BB. Would it be
worth switching to splined BB if replacing itanyway? Should I look at
something with integrated BB?

I have a 31.8mm band-on tigara double FD. Is there much chance this
would still work? (it runs from ergo levers so trimming is not a
problem)

BTW I presently have a campy mairage 9 RD on a sram 26-12 cassette
(yes, on a shimano hub) in case anyone wants to chuck in other
alternative suggestions

tia
james

 

[Günther Schwarz]

[email protected] :wrote

> I have a tiagra 4400 double (39-52) with a cheap shimano 68X110 square
> taper BB. I already have a crank puller and BB tool.

> Mirage Chainset Compact Alloy 2006 £39.95 (Parkers). Requires 111mm
> BB. Is it square taper, would 110 be close enough would my crank
> puller fit it?

Yes, the crank puller will do the job. But the chainset uses ISO square
taper while your existing bottom bracket has a JIS square taper.

> STRONGLIGHT Impact Compact £58 (Spa). Needs a 107 mm BB.

This one works nicely on one of my bikes. The rings from Stronglight are
not top quality, but work OK. Be aware that you want to mount the rings
rotated by 180° as the attachment pattern on the arms differs by 36° as
compared to other Stronglight chainsets (the Impact is a relabeled
Sugino XD with one bolt behind the arm).
Are you sure about the 107 mm? I'm using a 110 mm bottom bracket. This
is only a 1,5 mm offset anyway. Because of the big difference between
the rings the chain will likely rub on the big ring when using the
smallest sprockets. Using a slightly longer axle might help with this
problemino.

> I have a 31.8mm band-on tigara double FD. Is there much chance this
> would still work? (it runs from ergo levers so trimming is not a
> problem)

Just try. It is an easy part to replace if it dos not.

> BTW I presently have a campy mairage 9 RD on a sram 26-12 cassette
> (yes, on a shimano hub) in case anyone wants to chuck in other
> alternative suggestions

For the nasty climbs I have an old 32 from a MTB cassette in my parts
box. With a 33 tooth ring in the front this gives me almost a 1:1
ratio.

Günther

 

[Simon Brooke]

in message <[email protected]>,
[email protected] ('[email protected]') wrote:

> I have a tiagra 4400 double (39-52) with a cheap shimano 68X110 square
> taper BB. I already have a crank puller and BB tool.
>
> What would anyone suggest for switching to 34-48 for minimal cost?
>
> Mirage Chainset Compact Alloy 2006 £39.95 (Parkers). Requires 111mm
> BB. Is it square taper, would 110 be close enough would my crank puller
> fit it?

If you choose a new chainset with the same PCD as your existing chainset,
then if all else fails you can swap the rings from the old to the new.
Having said that, I would think a 1mm offset in chain-line would not be a
problem - the chain would be offset more than it should be in your
uppermost gear, but only very slightly; and you might want to avoid the
top two gears of your small ring, rather than just the top one.

Beware, though, that not all square tapers taper the same! I have had, in
the past a case where though both cranksets had the same taper, when fully
engaged on the taper the actual rings were in completely different places
(that's when I learned the trick of swapping the rings from the new to the
old) and there are also some makes of BB which taper more than others.

> STRONGLIGHT Impact Compact £58 (Spa). Needs a 107 mm BB. Would it be
> worth switching to splined BB if replacing itanyway? Should I look at
> something with integrated BB?

No. Splined BBs are not better, anyway, and integrated BBs offer no benefit
to ordinary cyclists. Both of these things are essentially marketing
driven, creating obsolescence in order to persuade people to junk
serviceable components and buy new. Yesterday, in the process of giving my
old road bike bike a quick once over before the winter, I stripped and
regreased the old fashioned cup-and-cone square taper bottom bracket. That
is the second time it has ever been stripped, in thirteen years and at
least 30000 miles. It was perfect, so I just cleaned out the old grease,
replaced with new, and reassembled. It will almost certainly run for
another six years. Your bottom bracket probably has several thousand miles
left in it.

Having said that, a Mirage chainset and a Mirage BB will cost less than the
Stronglight chainset, and while Stronglight are very nice, Mirage is also
perfectly nice and serviceable.

> I have a 31.8mm band-on tigara double FD. Is there much chance this
> would still work? (it runs from ergo levers so trimming is not a
> problem)

I'm pretty confident it would; your chainline should at most be 1mm further
out and that should be within the range of any decent mech. You will
probably want to lower it a bit, but since it's band on you can do this.

--
[email protected] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; part time troll.

 

[patrick j]

On Sun, 10 Sep 2006 08:16:59 +0100, Simon Brooke wrote
(in article <[email protected]>):

> Yesterday, in the process of giving my old road bike bike a quick once
> over before the winter, I stripped and regreased the old fashioned
> cup-and-cone square taper bottom bracket. That is the second time it
> has ever been stripped, in thirteen years and at least 30000 miles. It
> was perfect, so I just cleaned out the old grease, replaced with new,
> and reassembled. It will almost certainly run for another six years.

The old fashioned cup and cone bottom brackets will indeed run for ever imho
as long as they are adjusted with care on re-assembly.

They are every bit as efficient as the cartridge ones. I have one on my AM7
which is 20 years old and there is no need for replacement. I replaced the
bearings a couple of years ago.

--
Patrick

My bikes: Moulton AM7 and two Moulton APBs - an R18 and a "mongrel"
Pic of R18: <http://patrickjames.mysite.wanadoo-members.co.uk/R18.jpg>

A few paragraphs about the Scottoiler chain lubrication system:
<http://patrickjames.mysite.wanadoo-members.co.uk/scottoiler.html>

 

[Pete Biggs]

[email protected] wrote:
> I have a tiagra 4400 double (39-52) with a cheap shimano 68X110 square
> taper BB. I already have a crank puller and BB tool.
>
> What would anyone suggest for switching to 34-48 for minimal cost?
>
> Mirage Chainset Compact Alloy 2006 £39.95 (Parkers). Requires 111mm
> BB. Is it square taper, would 110 be close enough would my crank
> puller fit it?

Yes, yes and yes but the Shimano spindle starting diameter is wrong for
Campag cranks, so they will be drawn on too far or not enough (sorry I can't
remember which).

Mirage BB is £6.40 post free from http://www.dotbike.com/ProductsC19.aspx .
Check out the cranks there an' all. Will need a different tool though.

~PB

 

[Pete Biggs]

I wrote:
> Mirage BB is £6.40 post free from
> http://www.dotbike.com/ProductsC19.aspx . Check out the cranks there
> an' all. Will need a different tool though.

To clarify, I mean tool for the BB.

~PB

 

[James Thomson]

"Pete Biggs" <[email protected]> a écrit:

> the Shimano spindle starting diameter is wrong for Campag cranks, so
> they will be drawn on too far or not enough (sorry I can't remember
> which).

Shimano spindles are fatter, so a Campag crank will sit about 2-3mm too far
out on a Shimano taper.

James Thomson