Join Date: Jan 2007
Location: Dover, NH
Bikes: rigid 29er moto, s-works stumpjumper fsr,black fixie,masi roadbike, ugly old hardrock commuter
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The difference is in how much chain you need to wrap, which is determined by: The sum of the differences between the highest and lowest number of teeth on the biggest and smallest chainwheels, front and rear. For example, a crankset with 22t small ring and 44t large ring paired with an 11-34 cassette requires (44-22)+(34-11)=45t wrapping capability. This number should then be matched or exceeded by the number listed on the derailer. In laymens' terms, if you use a triple crankset get a long cage derailer.
Last edited by frankenmike; 03-12-12 at 08:41 AM.