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Rear Derailleur and Cassette questions

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Rear Derailleur and Cassette questions

Old 05-07-16, 06:44 PM
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Rear Derailleur and Cassette questions

Two cassette/rear derailleur questions.

I have a 10sp tiagra equipped bike, currently with a 12/30 cassette. I would like to go towards a more climbing oriented cassette. What ratio cassettes could I use with the current derailleur? If I want to go even more climbing oriented, could I change the derailuer (10sp Deore) too and still have it work with the STI shifters as they are?

Also have an 11sp Ultegra equipped bike, I do NOT want to put MTB derailiers or cassettes on it, but I am wondering if I can not go a little more climbing oriented then the current 11/25.
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Old 05-08-16, 06:51 AM
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Shimano data sheet will give you all the ranges you can use with present RD arm length, simple rule bigger cassette, longer RD arm length.

Another option rather than doing the RD way to to drop the small chain ring a few teeth.
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Old 05-08-16, 07:22 AM
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If you need a significantly bigger big cog, you will need an MTB rear derailleur but it will have to be a 9-speed rear derailleur. Shimano 10-speed road and 10-speed MTB shifters and derailleurs are not compatible. Shimano's 9-speed MTB rear derailleurs work perfectly with 10-speed road shifters.

BTW, what are the chainrings on your crank? Perhaps modifying, or even replacing it, may be less expensive than chaining both the rear derailleur and cassette.

Your Ultegra bike will certainly take a 11x28 cassette.
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Old 05-08-16, 11:16 AM
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A 12-30 is a very climbing oriented cassette. If you're in good health under 50, you should be able to go up a brick wall with that.

The standard 11 speed Ultegra RD will support up to 28 max with the 50x34 compact front.
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