Singlespeed & Fixed Gear - isis track crank compatible???
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08-20-08, 03:20 PM
Is this FSA isis bb (the 73 x 128 Platinum)
compatible with this crank (The Carbon Track)?
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?
08-20-08, 06:03 PM
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.
08-20-08, 06:28 PM
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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