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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 05-08-06, 09:29 PM   #1
Heraclitus
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Campy chainline help request.

I am building up a second fixed gear. I acquired a nice Pinarello road frame with 70mm Italian thread BB. My bro gave me a Campy Daytona (now called Centaur) crank set, but he had an English thread BB. So I need to get a new BB and dial in the chainline while I am at it.

Supposedly the Campy Centaur 111mm spindle will give me a 143.5 (measured as road double) chainline. It looks like there is about 5-7mm(?) between the chainrings, which I calculate would put the inner at 40-41 mm, the outer at 46-47mm.

I plan on an IRO/formula 130mm rear hub, which will have a 142mm chainline.

Any suggestions on best way to get this set up?
Is adjusting spacing on chainrings or hub the answer?
Which is preferred and how much room can I count on?

Is there any hope of using the outer chainring (for aesthetic purposes, obviously)?

Just eyeballing it, it looks like the crank needs to be almost flush with the BB shell to get the outer chainring to the 42-44mm range.

Could be done with a Phil BB? would I need a shorter spindle?

Advice and help much appreciated!

Thanks~!
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Old 05-09-06, 07:20 AM   #2
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You do not have a 143.5mm chainline. Most are from 42-52mm. Read Sheldon, check your measurements and terminology, and try again.

That said, I'd guess you meant to say you have a 43.5mm chainline. This is pretty good. A difference in chainline of 1.5 mm is pretty damn negligible in my book. If you must fine-tune it, see if you can get a 108mm spindle. This will move each crank in 1.5 mm (3mm total length change), thus giving you a perfect chainline. Alternatively, you could get a 1.5 mm spacer for your cog. As long as you still have plenty of thread engagement on both the cog and lockring, this could be the way to go.
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Old 05-09-06, 07:35 AM   #3
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Ahh, campy taper spindles. Such a pain in the ass, but so worth it in the end... I hope. You can try a Miche BB, which has a 107mm campy taper spindly, and is adjustable left-to-right, so your chainline should be near-perfect. For a high end option, try Phil wood. I'm sure their BB system will sort you out, for $150 or so.
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Old 05-09-06, 08:26 AM   #4
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Quote:
Originally Posted by moki
Ahh, campy taper spindles. Such a pain in the ass, but so worth it in the end... I hope. You can try a Miche BB, which has a 107mm campy taper spindly, and is adjustable left-to-right, so your chainline should be near-perfect. For a high end option, try Phil wood. I'm sure their BB system will sort you out, for $150 or so.
Ah-hah... I didn't know about Miche fitting campy and that it might give me a different spindle length option. I will look at those -- thanks.

I have done a little more searching and digging through old posts and unless the Miche idea works out it does sound like Phil Wood may be the safest (albeit relatively expensive) route. Still it probably beats buying a bottom bracket AND a set of cranks.
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Old 05-09-06, 08:27 AM   #5
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Miche BBs also come in 110mm and 113mm spindle length.
I have my own thread trying to figure out which one I need.
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Old 05-09-06, 02:45 PM   #6
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EDIT: Okay.. I figured out that Campy and Miche are both ISO taper... this might work. Thanks.

Last edited by Heraclitus; 05-09-06 at 02:51 PM.
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