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Old 02-13-08, 05:27 AM   #1
jackcoke
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SRAM Rival Der. to Cassette Compatibility

I have a SRAM Rival 10 sp. derailleur and cassette. The cassette has a 28t cog on it(lots of hills in Seattle). I noticed on several sites that sell SRAM derailleurs that they only support up to a 27t cog. I had a problem recently that is in another thread where my derailleur got hung up in the wheel and cassette and bent my hanger. I thought, and still do, that it was caused by when my bike previously fell over.

My question is....why would they sell a 28t cog on a cassette(Rival) when the matching derailleur(Rival) doesn't support it? Why does the box not mention it? Is there really that much of an issue? Could it have caused my problem?
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Old 02-13-08, 09:01 AM   #2
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Most manufacturers have very conservative max tooth ratings for their rear derailleurs. Shimano states their road derailleurs have a 27T max but experience shows they will almost always work fine with a 30T cog and sometimes with a 32T. Unless SRAM is way different, a 28T cog should cause no problems.

I expect your problem was indeed caused by the bike's fall, particularly if it landed on the drive side.
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Old 02-13-08, 09:21 AM   #3
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Thanks. Yes, it did fall on the drive side.
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