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Will Shimano Claris medium cage RD shift 34T?

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Will Shimano Claris medium cage RD shift 34T?

Old 10-17-17, 02:04 PM
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Will Shimano Claris medium cage RD shift 34T?

Curious if anyone has experience with Shimano Claris medium cage RD (2400-GS) and a 34 tooth cassette. The bike in question comes with 32T and I would like it much better with 34T. I have made the switch from 32 to 34 with my Alivio RD and have had no issues. Hoping to get the same result with Claris on the new bike. Thanks.
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Old 10-17-17, 02:26 PM
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setup will be tricky, but it sounds like you've already handled that before...

a long cage der. would be preferred... Triple front? then definitely a long cage, IMO.

Big/big and small/small testing will get real interesting!

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Old 10-17-17, 09:49 PM
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Without data like the high gear cog tooth count, the hanger" axle to der bolt dimension, the front ring(s) who knows. But usually one can exceed the capacity of a rear der with some sort of issue elsewhere emerging. Andy
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Old 10-18-17, 08:01 AM
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Crankset is Claris 30/39/50 and stock cassette is 11-32 for a total chain wrap of 41 links. Shimano lists max chain wrap for Claris RD at 41 links. Changing to 34 cassette would require chain wrap of 43 links - just not sure if the RD would handle that with a B screw adjustment.

Another option is to install 28/38/48 crankset and leave cassette at 32T. This would allow lower gearing and stay at the Shimano chain wrap spec of 41 links. This might be the best solution without changing rear derailleur.
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Old 10-18-17, 09:22 AM
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You could also size the chain for big-big (with the original 30/39/50 rings and a 34 cog) and just not use the small-small combination. That's not a whole lot of functionality to give up, if you have to compromise something.
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Old 10-18-17, 11:19 AM
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minimal difference in chain ring sizes can help , B screw tightening can help too ...

ran a short cage Chorus as a single ring and a 13~34t freewheel ..
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Old 10-18-17, 08:38 PM
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Since you already have a 34t on another bike, why not just swap wheels, or cassettes and see if it works?
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Old 10-19-17, 06:34 AM
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Originally Posted by Slightspeed
Since you already have a 34t on another bike, why not just swap wheels, or cassettes and see if it works?
My philosophy. If I already own parts, I'll bolt up almost anything and see if I can get it to work to my satisfaction. If I'm BUYING parts, I'm only going to get stuff that's supposed to work together.
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Old 10-19-17, 10:02 AM
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Great advice. I'll just try the wheel and cassette I already have and see how it works on the new bike. Thanks All!
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