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Old 03-28-12, 07:14 PM   #1
canflyboy 
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Will a 32t cassette work with a RD6600 Ultegra?

Hi all

I first posted this question in the cyclocross forum, but I think that some tourers might have tried this.

Shimano states that the maximum cassette size is a 27 tooth for an RD6600 and a 28 tooth for the RD6700.

Will a 32T MTB gear work?

The reason I ask is a gentleman, 72 y.o., is using my old cross bike in the Paris - Ancaster race. He asked if I had a larger rear cassette to make it easier on him. For fun, I took a 32T cassette off my 29er and installed it on the Tiagra equiped bike and in works superbly. No issues at all.

Before I spend money on a new cassette, I was hoping someone already tried something like this and could offer some guidance.

Thanks

Canflyboy
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Old 03-28-12, 08:57 PM   #2
unterhausen
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I am using a 6700 mid cage rear derailleur with a 32 tooth 9 speed cassette. I have 50/32 on the front. You have to adjust the screw at the dropout to add clearance. It's not a recommended setup, and they obviously didn't mean for you to use it, but it does work just fine. I know people that are using a 34 tooth cassette with the same setup
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Old 03-28-12, 10:03 PM   #3
canflyboy 
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Thanks - I'll give it a try. Should work on the Ultegra if it works on the Tiagra.
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Old 03-30-12, 12:49 PM   #4
ks1g
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I've done this a few times for particularly hilly century rides. Long cage (triple) Ultegra 9 speed RD and 32t 9-speed MTB cassette. Remember to lengthen chain (add 4-5 links) or NEVER go near big-big (if you are lucky you will lock up your drive train but be able to clear it. Not so lucky you'll have to hope you brought a chain tool so you can break the chain). And adjust the screw as "uh" said (I think it's the "B screw"). Shifting not as crisp and the larger jumps can be an annoyance on flatter terrain. Some folks replace RD with an MTB derailluer designed for the larger gear range. MTB cassettes are relatively cheap, as is a SRAM 950 chain. At least compared to different cranks, let alone a new drive train!

I had ZERO success trying this on 10 speed (DA/Ultegra mix, SRAM Apex cassette). On a different bike (SRAM drivetrain), swapping in a SRAM's Apex 32t cassette and Apex RD worked quite well.
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Old 05-06-12, 12:31 AM   #5
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Hello

can you please tell me which crankset do you ride . I m interesting in combination 50 32.
Thanky you
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