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11-23 to 12-28?

Old 04-07-09, 08:58 AM
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johnism
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11-23 to 12-28?

So I have a 11-23 and am wanting to try a 12-28. Now will have to readjust my RD at all or will it all just work?
Also could I leave the smaller cogs and just replace the three largest combined cogs, so instead of 12 -28 I would have a hacked 11-28?
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Old 04-07-09, 09:00 AM
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1) you may need to adjust the B-Limit screw
2) You can do that - nothing will blow up - but you'll have some really ****ty shifting.

Also, you may need to lengthen your chain.
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Old 04-07-09, 09:03 AM
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You should check the derailleur and adjust as needed, but if it's properly set up, you won't need it. I swap between an 11-28 and an 11-25 back and fourth without hesitation. You should be just fine using half of one cassette and half of the other, especially if it's the same model cassette. Finally, make sure the chain isn't too short for the 28 should you cross shift it with the big ring.
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Old 04-07-09, 09:40 AM
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what is a good way to test for cross shifting issues...big ring to big ring, then start shifting down?
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Old 04-07-09, 09:48 AM
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Check the manufacturer specs to see if the derailleur is big enough. If your chain is the proper length for the 23, you will have to get (or lengthen) another one for the 28.
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Old 04-07-09, 09:49 AM
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You'll know if your chain is too short when you shift to the largest, or second-largest, cog while in the big ring.
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