Old 09-10-11, 02:30 PM
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robertkat
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Help: 9 spd MTB rear mech with 10 spd cassette

I've heard about using 9 speed MTB derailleurs with 10 speed cassettes. I need some help understanding this. Here's me situation: I currently have, on my brevet bike, 6700 derailleurs with 7800 down tube shifters. 10 speed. I have a 48/34 crank and I'd like change my cassette get some lower gearing, maybe a 32 or 34 large cog on the cassette. It's my understanding that the long cage 6700 derailleur will have trouble with this and that I can use a 9 speed XT or XTR and I will work great with my shifters indexing cable pull. Would I need to long cage mech or would the medium be ok? I do know that Shimano has different requirements for cable pull on the road and MTB derailleurs so I cannot use one of the new 10 speed MTB mechs.

Does anyone have experience with this set up? How does this work? Also consider that I may be changing to a 46 tooth big ring on my crank, in case chain wrap is an issue.
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