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Old 09-14-16 | 01:43 PM
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rpenmanparker
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From: Houston, TX

Bikes: 1990 Romic Reynolds 531 custom build, Merlin Works CR Ti custom build, super light Workswell 066 custom build

Originally Posted by Dan333SP
He's just trying to figure out a compatibility chart for mix 'n match groups. That can be important if he buys the current Tiagra levers and finds out that they can't shift a 6600 RD correctly even though they're both 10 speed parts, ect.
I guess I understood that. I think the best bet is to just assume incompatibility except in the very few well publicized cases of known compatibility. Examples are the 8-speed Shimano RDs and 9-speed levers and the SRAM 10-speed RD with 11-speed levers.
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