Originally Posted by
cobba
Shimano's 10 speed road and 11 speed road aren't compatible, they use different cable pull ratios.
Yes, I understand that's true nearly across the board. But I think the new 4700 is now the exception. It uses ratios that
more closely match the redesigned (11 speed) stuff; FD for example. So it's more likely to work with 5800 than 5700. The rear shifting is the larger mystery: likely a different cable pull from older 10 speed groups (like CafeVelo says)...but still 10 speed spacing which is different than 11.
Sounds like if I were to consider this, running a 4700 RD would be a safer bet.
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'14 carbon Synapse - '12 CAAD 10 5 - '99 Gary Fisher Big Sur
Last edited by dtrain; 12-16-15 at 01:15 PM.