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Old 01-14-06, 12:26 PM   #1
mooncake
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Why is an Ultegra front der cage so narrow?

I have a new Scott Cr1 Pro 2005 that I stole on close-out and I really like the bike but the front derailleur is real narrow - easy to get chain rub if you don't have the limit screws dialed in to the mm.

Does Shimano make a narrower chain? The stock Ultegra chain is their 10-speed but I notice my Campy 10 speed chain is narrower. Help?
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Old 01-14-06, 12:33 PM   #2
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I've noticed the same thing and I believe I have the narrowest Shamino chain for 10 speed. I find I have to decide how I want to use the front. For example if for example I am in the smaller ring in the front and I want to be able to use the larger rings in the back for hills than there will be some rub when I shift down to the 2 smaller cogs in the back. I figure this is not a problem as at that point I should be using the larger ring in the front anyway at that point.
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Old 01-14-06, 12:39 PM   #3
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The cage is narrow to shift better. If it's dialed in right the trim shifts should take care of it. A triple front der. cage is a little wider, so if it's really a problem you could switch for one of those.
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Old 01-14-06, 12:51 PM   #4
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Yeah, the narrower cage shifts better since you don't have to move the deraileur much before it pushes on the chain. I find you can reduce rubbing quite a bit by unbolting the rear of the cage, inserting a washer to spread the apart by 1-2mm, then bolt it back together. This lets the chain sweep across the rear-cluster more before it rubs on the cage. Doesn't hurt shifting performance very much because the front is still narrow.
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Old 01-14-06, 09:38 PM   #5
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Quote:
Originally Posted by DannoXYZ
Yeah, the narrower cage shifts better since you don't have to move the deraileur much before it pushes on the chain. I find you can reduce rubbing quite a bit by unbolting the rear of the cage, inserting a washer to spread the apart by 1-2mm, then bolt it back together. This lets the chain sweep across the rear-cluster more before it rubs on the cage. Doesn't hurt shifting performance very much because the front is still narrow.
Just hit the basement. I like that - even my triple rubs. At first I thought it was riveted but the screw is hidden on the inside.
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Old 01-15-06, 03:07 AM   #6
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Quote:
Originally Posted by kahn
Just hit the basement. I like that - even my triple rubs. At first I thought it was riveted but the screw is hidden on the inside.

Quote:
Just hit the basement
What do you mean?????
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