Originally Posted by HillRider
Minor point but 10-speed cassettes aren't any wider than 9 or 8-speed cassettes, its just the spacers and cogs are thinner. They all fit on the same width freehub body so derailleur travel that's enough for one is enough for any.
Shimano's 10-speed cassettes are a little wider than 9-speed cassettes (there's a little recess on the back of the spider for the largest cogs allowing them to extend past the inside of the cassette body) but the range of travel on standard derailleurs is plenty large enough to compensate.
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