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Larger cog, when a new chain?

Old 04-28-13, 09:44 PM
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Larger cog, when a new chain?

I have a 11-26 and I want to put on a larger cassette cog. How much larger of a cog can I put on without replacing the chain?
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Old 04-28-13, 10:21 PM
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Assuming your chain is properly sized, 0 or 1T.
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Old 04-29-13, 09:57 AM
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1. Unless your chain is brand new, or nearly brand new, not replacing the chain when you install a new cassette is a false economy. Your worn chain will prematurely wear your cassette cogs.

2. Shift into your big/big combination. The amount of slack your chain has in the bottom run will determine how much bigger a cassette cog it will handle. If your chain was properly sized using the little/little method, there's a good chance it will handle at least a couple more teeth.
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Old 04-30-13, 12:28 PM
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I just replaced my old ultegra 11-27 with an 11-28. Replaced the chain also, sized the new one exactly to the old one. Worked perfectly.
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