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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 02-04-08, 09:03 AM   #1
daveed
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Will a double do me?

Just a quickie chainline question:

For a '77 Peuguot conversion (to fixed, of course) am I better off using a road double to get a decent chainline with, say, a 107 or 110 BB -- or will an old triple (which I happen have) do the job?

I know a new track crank would probably work best but I have access to used components. Hub: Harris Cyclery brand.

Any specific recommendations from those who have converted a bike like this would be greatly appreciated.
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Old 02-04-08, 09:08 AM   #2
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I'd rather use a double, but if you have the parts lying around, slap them on there and see if you can get it to work - I dunno about you but I love tinkering around and trying to get stuff to work when I'm not sure whether it will or not. If not, no harm done, right?

Besides, I don't really know the answer off the top of my head.
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Old 02-04-08, 09:10 AM   #3
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i imagine it Could be done with either but with a double it would be easier to sort any chainline issues

What BB length you need is upto you to figure out but if you are using a triple i imagine your going to need something shorter than 107, Or maybe i have no idea what i'm talking about. Set it up and measure.
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Old 02-04-08, 09:24 AM   #4
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Originally Posted by Kol.klink View Post
Set it up and measure.
Really, that's just the best advice. It's easy to give it a quick check, and there's info on Sheldon Brown's site regarding how to measure everything. Be aware that you may not have non-standard bottom bracket threading: http://cyclespeugeot.com/Threading.html. If it's not ISO, hold onto those bottom bracket cups if you find you need a different spindle length.
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Old 02-04-08, 09:30 AM   #5
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Three potential probs with a triple:

1. cosmetic. A crank can be a beautiful piece of metal. Unnecessary bumps and such would bother some people.

2. chainline. the two outer ring positions are likely farther outboard on a triple, and getting the chainline as in-board as possible is the name of the game in a conversion.

3. Rub on chainstay. If you bring the crank in by using a shorter spindle, you may find that the attachment points for the granny gear will hit the chainstay. Of course they can be ground off to avoid this issue.

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Old 02-04-08, 10:03 AM   #6
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Originally Posted by kyselad View Post
Really, that's just the best advice. It's easy to give it a quick check, and there's info on Sheldon Brown's site regarding how to measure everything. Be aware that you may not have non-standard bottom bracket threading: http://cyclespeugeot.com/Threading.html. If it's not ISO, hold onto those bottom bracket cups if you find you need a different spindle length.

Fortunately, the BB shell is English threaded. I'm familiar with Sheldon's brilliance, having set up my other FGs according to his instructions. But today I wondered if the double was the best (and fastest) route to chainline happiness. Given everyone's helpful advice, I'll now assume it is.

Thank you.
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