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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 12-01-09, 07:08 PM   #1
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Fixed/Freewheel Build on Track Frame : Some tech questions before I buy parts..

Hi guys,

I have a CIOCC Mockba 80 (reissued) singlespeed/fixie frame and planning to do a build with some old parts I have lying around. The parts I plan to re-use is

- shimano 600ex quill stem, 120mm
- ultegra 6600 brake calipers

therein lies the next question, I have a Shimano Sante crank (170mm) and a italian threaded bottom bracket (square tapered) and was wondering if it can be used on this track frame. The Sante crank and BB are from an old steel road bike (126mm rear dropout spacing) which I decommissioned some years back, they are in good condition. Will I be needing a new bottom bracket? does this have a huge impact on 'chainline'?

Also, I need to swap out the double chainring and put in a single one. I do not know what is the BCD for the Sante crankset, I assume its standard with shimano of the day?

For the wheels, I'm planning a simple build, 32 spoke on a track fixed/free hub using mavic open pros.

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Old 12-01-09, 07:17 PM   #2
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you will probably have to get a new BB in order to achieve a straight chainline b/c that BB was meant to be used on a double crank. It's hard to know what type of BB you will need, though. You can take off one of the chainrings but you will have to get shorter chainring bolts b/c the ones on there now are longer to accomidate for that 2nd chainring. Wheelbuild sounds good. Formula hubs will suit you just fine and still be cheap.

If you want to avoid some of these crank/BB issues, just get a new crank and BB. Or you can try and see if your current one will work, but if it doesn't then I would consider just getting a new crank and BB.

Sounds like it's gonna be a sweet build
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Old 12-01-09, 10:17 PM   #3
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My approach with parts that I already own is to trial fit them and see if they'll work. In your case, even if you fail to get a straight chainline you'll be able to tell what length BB spindle you'll need to make it right.

FWIW, I built my fixed gear conversion using an Ultegra double crankset from another bike. The inner gear position yielded a perfect chainline. I just had to use some shorter chainring bolts.
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