Rear der capatibility if I switch from Shimano 12-25 to 12-27?
12-23-05, 12:04 PM
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Can I still use my Ultegra stock short cage rear d. if I go to a climbing cassette 12-27 from 12-25? Thanks. 
12-23-05, 12:37 PM
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Your derailleur will be fine. It may or may not be necessary to lengthen your chain by a couple of links.
12-23-05, 02:02 PM
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Originally Posted by Retro Grouch
Your derailleur will be fine. It may or may not be necessary to lengthen your chain by a couple of links.
12-23-05, 03:01 PM
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Originally Posted by mooncake
Any tell-tale signs that your chain length is messed up?
12-23-05, 03:47 PM
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Originally Posted by mooncake
Any tell-tale signs that your chain length is messed up?
RG's technique is the best one if you are installing a new chain. If you are going to use the existing chain (probably not a good idea with a new cassette) try VERY CAREFULLY to shift into the big chainring/big cog combination. If it goes in easily, no problem. If there are any signs of distress, STOP right there and plan on lengthening the chain or, beter yet, replacing it.
