Originally Posted by
Bonts
I think I’ll go for a standard 50/34 or similar and just live with the couple illegal shifts. I’ll have to check my freehub for cassette options. It’s possible that it’s a 10 speed with spacer which would make it compatible with 11 speed cassettes. If I end up needing a new deraileur, I’d probably go ahead and make that upgrade.
11 speed would require a complete new shift setup. Different shifter, FD & RD.
Shimano changed the 'pull' ratios for 11 speed, so FD & RDs are not compatible between 10 & 11 for most road groups.