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Old 10-04-09, 06:31 PM   #1
billydonn
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Ultegra 6500 vs. Ultegra 6600 RD

Shifting with 9-speed STI units, is there any reason not to use the 6500 Ultegra FD, as opposed to the 6600? Ad for 6500 says "The FD-6500 Ultegra front derailleur features an extra wide cage to increase strength and extends service life. Indexed for light-action SIS shifting. 9 speed compatible."

Thanks.
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Old 10-04-09, 06:41 PM   #2
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FD or RD?

RD, doesn't really matter

FD, it's best if you stick to the same speed the chain is, since a 9sp chain is more likely to rub on a 10sp FD, and a 10sp chain will have sloppier shifting on a 9sp FD.

mind you, you can totally get away with mixing 9sp and 10sp FD/chain without a huge issue.
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Old 10-04-09, 07:08 PM   #3
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For all intents & purpose, I can't find any real difference between the RD 6500 and RD 6600 rear-derailleurs. I've had both and they shift like a dream.

Here's the bargain to end-all bargains. An RD 6500 for under $40 - brand-new:

http://www.cambriabike.com/shopexd.a...EAR+DERAILLEUR
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Old 10-04-09, 07:17 PM   #4
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FD or RD?

RD, doesn't really matter

FD, it's best if you stick to the same speed the chain is, since a 9sp chain is more likely to rub on a 10sp FD, and a 10sp chain will have sloppier shifting on a 9sp FD.

mind you, you can totally get away with mixing 9sp and 10sp FD/chain without a huge issue.
Opps... Very Sorry... it is FD I am talking about. 6500 vs. 6600 front derailler. Am using 9-speed chain, brifters, etc.
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Old 10-04-09, 07:25 PM   #5
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it's best if you use a 9sp FD, 105 5500, ultegra 6500 or tiagra 4500, but it's not a big issue if you don't.
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Old 10-05-09, 02:44 PM   #6
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Are you talking about a front derailleur with a double crankset?
The 9-speed FD should work better with a 9-speed chain.
If triple you'll need the 6503.

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Old 10-05-09, 03:09 PM   #7
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The FD 6503 can only be used on frames that run the cables underneath the bottom-bracket shell. It's a bottom-pull derailleur. If you have a Hybrid or a Mtn-Bike, you'll need something other than an Ultegra FD. One that is either top-pull of dual-pull.
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Old 10-05-09, 04:11 PM   #8
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Originally Posted by billydonn View Post
Shifting with 9-speed STI units, is there any reason not to use the 6500 Ultegra FD, as opposed to the 6600? Ad for 6500 says "The FD-6500 Ultegra front derailleur features an extra wide cage to increase strength and extends service life. Indexed for light-action SIS shifting. 9 speed compatible."

Thanks.
I ran a 6600 with my 9 speed before going full 10 speed. With trim I wouldn't get any chain rub until the extreme crosses.

If you can get a 6500 you may as well, I got the 6600 because I was having trouble sourcing a 6500 and I knew I was going to be going full 10 in a few months.
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Old 10-05-09, 05:25 PM   #9
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I mix front derailleurs of all types. It doesn't seem to matter much. If it shifts and doesn't rub you're golden.
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