Bicycle Mechanics - 6700 & 6600: are they cross compatable?

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Barrettscv
03-23-11, 03:42 PM
Can I mix & match Shimano Ultegra 6700 and 6600?

JiveTurkey
03-23-11, 03:53 PM
The only mechanical change I've heard is that there is now a 28T cassette available, which makes me think the rear derailleur was modified to allow the slightly larger cog (6600 max-rated cog was 27T).

(By the way, it's "mix and match.")
learnmedia
03-23-11, 04:18 PM
I believe so. However, Shimano tech documents refer to A (fully) compatibile and B (somewhat less so) compatible depending on the specific component. I am running 6700 shifters with otherwise all 6600 (actually Ultegra SL) groupset. Works great.

jimc101
03-23-11, 04:26 PM
Yes, apart from the brakes, which do have some issues, but I have run 6700 shifters with 6600 brakes, and did't find there was any major loss in brake power. Here's the chart

http://bike.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50lparsys-0025-downloadFile.html/01)%20Drivetrain%20Compatability%20Chart.pdf
pshotwell
03-29-11, 10:37 PM
I have a SRAM Elita Triple Crankset, with 6703 Derailleurs and Shifters. I'm curious towards getting a double crankset (don't ask me why), but I'm having trouble believing that the shifters wouldn't function properly given a new double front derailleur and possibly replacing the long-cage in the back. Does anyone think there's a possibility it could be made to work? Thanks for any insight.