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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 08-20-08, 02:20 PM   #1
stomppow
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isis track crank compatible???

Is this FSA isis bb (the 73 x 128 Platinum)

http://road.fullspeedahead.com/fly.a...layout=product

compatible with this crank (The Carbon Track)?

http://road.fullspeedahead.com/fly.a...layout=product

They're both ISIS, but I'm wondering if the spindle is too long or too wide or something, basically, are they the same standard?
Also is the chainline adjustable?

Any other ISIS track cranks, or road double cranks?

Thanks
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Old 08-20-08, 05:03 PM   #2
fixedpip
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They'll work as all ISIS stuff is inter-comaptible.

Where you have to be careful is BB length. The FSA fancy track BB (which probably matches this crank) is 108mm, so thats the BB length you should use with this crank - it doesn't have to be the track one.

BB's are speced with too numbers. The first (73 in your case) is the Bottom bracket shell width and the second (128) is the axle length. 73mm is a typical width for a Mountain bike BB, most road/track bikes are either 68mm(English) or 70(Italian).

I doubt the chainline is adjustable...

There aren't too many ISIS spec'd track cranks (because its a niche spec and track is a niche market). A lot of track bikes (the Bianchi Pista) for example had converted road cranks (Truvativ Turuos?) mated to an ISIS BB.

Last edited by fixedpip; 08-20-08 at 05:10 PM.
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Old 08-20-08, 05:28 PM   #3
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okay thanks

So I guess I could use the 128 spindle with those cranks, and end up with a chainline of roughly (128-108)/2 = 10mm more outwards, which is probably around 53mm.

I guess I should find some road double ones, as the track ones are so expensive. Steel>CF
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