Bicycle Mechanics - Compact crank & Shimano cassette compatibility
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
02-26-06, 12:40 PM
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.
02-26-06, 01:17 PM
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.
02-26-06, 01:17 PM
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.
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.
No. These cranks use an ISIS spline pattern, and your Shimano BB uses an Octalink spline pattern.
Powered by vBulletin® Version 4.1.12 Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.