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1x10 rear derailleur help

Old 05-28-12, 10:38 PM
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gdmfsob
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1x10 rear derailleur help

so i've decided to convert to a 1x10 setup on my cross bike. i'm thinking of going with a 42t ring and either a 11-32 or a 12-32 cassette. i've never setup a 1x10 before and i'm wondering if my current rear derailleur (sram force short cage) will work? i know it's only recommended for a 28t max but since i'm only running a single 42t up front, will i be able to get away with using it? or do i need a long cage rear derailleur? i know sram is releasing a force wifli rear soon, which is great but i'd rather not have to spend more money if i don't have to.
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Old 05-29-12, 03:36 AM
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You can generally exceed the maximum my a tooth or two without problems, but in this case I'd recommend using a 'mountain' rear derailleur as these usually have a larger limit.

Personally though, I wouldn't do a 1x10 setup. You could get a much more durable drivetrain with the same number of gears by going for a 2x5 half-step setup. Alternatively, get a 7 or 8-speed IGH for even more durability and simplicity.
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Old 05-29-12, 05:56 AM
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you need a sram mtn 10sp rear der. you need the max cog capacity that the mtn derailer provides.
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Old 05-29-12, 09:34 AM
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Rear derailleurs have two specifications, the largest cog they will handle and the amount of chain they will take up. While running a single chainwheel will reduce the amount of chain needed to be taken up, the largest cog limitation will still be a consideration. Exceeding that limit by a tooth or two is usually OK, but four is pushing it. The mountain derailleur is really what you need.
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