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Old 02-26-06, 12:40 PM   #1
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Compact crank & Shimano cassette compatibility

Was looking at a Forte Circuit Compact Crabon crank with 50-34 teeth. A few questions:

1- Will the crank work with a Shimano cassette which is a 12-25 hyperglide?

2- Will this crank give the best overall low end and high end like that of a triple chain ring for climbing as well as flats?

3- Will I be able to use my Ultegra BB which is a 68 x 118 8 spline pipe billet?

Thanks for any feedback.
Ego Campana Inflectum of Circuitous
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Old 02-26-06, 01:17 PM   #2
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1. Yes, there's no reason that it wouldn't. Cranks don't contact cassettes - as long as they'll both use the same chain (and in this case, they will) and if you have a derailler that can take up enough chain slack (29 teeth's worth, although in practice I think your max range would be 26 teeth's worth), then you're good.
2. Not quite. It gives almost as high of a gear as a typical road triple with 52t chainring, but not as low of a gear as a road triple with 30t small chainring, and certainly not as low as a 110mm bolt-pattern triple with 26 or 24t small ring. But 34*25 is a pretty low gear nonetheless.
3. I don't know.

I'm not sure what sort of riding you do, but if you have long climbs out near Asheville/Boone area, and like to sit while you climb, you might stick with a triple. Here in Chapel Hill, I've got a triple and never touch my granny ring, even up 2/3 mile hills.
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Old 02-26-06, 01:17 PM   #3
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  1. Yes. Cranksets don't interact with the cassette at all, only the chain. This one will work perfecty well with either an 8, 9, or 10-speed chain.
  2. No. Triples have the widest gear range of any type of crank. A typical road triple will have a 30-tooth small chainring and a 52-tooth large chainring. This compact double (pretty typical) has a 34-tooth small chainring and a 50-tooth large chainring. They're pretty much smack in the middle of a standard road double and a standard road triple.
  3. No. These cranks use an ISIS spline pattern, and your Shimano BB uses an Octalink spline pattern.
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