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running an 11-32 cassette with the new ultegra 6700 medium cage

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running an 11-32 cassette with the new ultegra 6700 medium cage

Old 09-03-12, 09:04 PM
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m2tiguy
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running an 11-32 cassette with the new ultegra 6700 medium cage

good evening,
just a quick question, can I run this combo, ???
Don't want to buy all new group to gain a little bottom end
thanks
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Old 09-03-12, 09:14 PM
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Originally Posted by m2tiguy View Post
good evening,
just a quick question, can I run this combo, ???
Don't want to buy all new group to gain a little bottom end
thanks
The Shimano 6700 rear derailleurs are rated at 28T for both the SS and GS (medium cage). The longer cage is designed to take up more chain, needed for a triple crank, it does not increase the max cog. However, others have said the have used a 30 or 32T with the SS; it depends on the length of a bikes dropout, the b angle adjustment, and what you are willing to put up with; I usually stay with rated max cogs..You can however use a 9 speed MTB derailleur, which will work with the 6700 shifters.

Last edited by onespeedbiker; 09-04-12 at 11:01 AM.
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Old 09-04-12, 12:23 AM
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The proven option is a 9-speed MTB derailleur. Another option is the Ultegra 6700A rear derailleur which is rated at 30T max cog, which is probably close enough to 32T to work without issues.
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Old 09-04-12, 12:33 AM
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Since this is 10-speed, I wouldn't expect the bigger cogset to shift reliably with the road derailer.

Even the current 11-28t cassettes make for short service intervals, since the derailer doesn't track the cassette's profile very well at all.

If you do try this, make the chain long enough and switch the pulleys so that the non-floating pulley is in the top position, and observe the directional rotation of each pulley. It just might work well enough if you can avoid using the smallest sprockets front and rear at the same time.

BTW, I would expect even the new 11-30t cassette to benefit from using a non-floating pulley in the top position.
I used to max-out road derailers with 9sp cassetes, but 10s cassette spacing changes everything with respect to the need for more-precise derailer positioning.

Last edited by dddd; 09-04-12 at 12:42 AM.
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Old 09-04-12, 12:45 AM
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Speaking of this issue, this brings up a question I have. I switched out the crankset on my bike and converted it to drop bars with 9 speed brifters. I want to use a 11-28 cassette and my crankset is a 52-42-30. The problem I am having is that the rear derailleur rubs, the centurion pulley hits the 28t cog. I got it as good as I could but I had to use a XTR mountain bike derailleur. Is there any way I could swap it out for a different rear derailleur. I have a Deore XT that I would rather use but when I used it, the rubbing was worse.

What should I look for in regards to the rear derailleur.
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Old 09-04-12, 09:07 AM
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Cranking the B screw in will increase the guide pulley clearance, over the big cog,
at the expense of closely following the small ones, its a trade off..

Want lower gear on a road triple ? maybe loose a couple granny gear teeth..
30 to a 26 (to ~ half the tooth count of the big CR)
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Old 09-04-12, 11:09 AM
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Originally Posted by bobotech View Post
Speaking of this issue, this brings up a question I have. I switched out the crankset on my bike and converted it to drop bars with 9 speed brifters. I want to use a 11-28 cassette and my crankset is a 52-42-30. The problem I am having is that the rear derailleur rubs, the centurion pulley hits the 28t cog. I got it as good as I could but I had to use a XTR mountain bike derailleur. Is there any way I could swap it out for a different rear derailleur. I have a Deore XT that I would rather use but when I used it, the rubbing was worse.

What should I look for in regards to the rear derailleur.
What brand rear derailleur are you using (centurion pulley?). If you mean Campy Centaur, the max cog is 27 and Campy usually rates it's derailleur very close. My next question is the same as fietsbob; have you adjusted the b-angle adjuster for a max size cog?
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Old 09-04-12, 11:51 AM
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Originally Posted by onespeedbiker View Post
What brand rear derailleur are you using (centurion pulley?). If you mean Campy Centaur, the max cog is 27 and Campy usually rates it's derailleur very close. My next question is the same as fietsbob; have you adjusted the b-angle adjuster for a max size cog?
Centeron. I believe that all Shimano rear derailleurs since the 90's have been calling them Centeron pulleys. The derailleur is an XTR mountain bike derailleur. I just don't like how it looks on my current bike. I would rather replace it with a Deore XT rear derailleur I have (late '90s era) but I'm not sure how that will work out.
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Old 09-04-12, 01:33 PM
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The 6700 GS rear derailleur is a long cage road derailleur designed to wrap up more slack chain when running on the smallest chainring of a triple crankset. It has the same maximum cog size limit (28t) as the short cage RD.
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Old 09-04-12, 02:30 PM
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Originally Posted by bobotech View Post
Centeron. I believe that all Shimano rear derailleurs since the 90's have been calling them Centeron pulleys. The derailleur is an XTR mountain bike derailleur. I just don't like how it looks on my current bike. I would rather replace it with a Deore XT rear derailleur I have (late '90s era) but I'm not sure how that will work out.
Okay, my bad, you mean the upper pulley with a small amount of sidewards motion (it's been a while since I heard it called Centeron®). Even with a 28t cog it should not be hitting the upper pulley, so I'm guessing it's either a bent derailleur hanger or a b angle adjustment issue.
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Old 09-04-12, 03:42 PM
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Centurion was the Roman Empire's military platoon leader, of 100 soldiers.
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Old 09-04-12, 04:29 PM
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Originally Posted by fietsbob View Post
Centurion was the Roman Empire's military platoon leader, of 100 soldiers.
And a pretty decent value-packed bicycle brand of the '70's and '80's imported from primarily Japan and later Taiwan.
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