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I think 28t is official max on the short cage mech, a 30t might work. Any Shimano 11sp road long cage rear mech will work with the shifters afaik.
TA or Stronglight do rings. It’ll cost as much as a chainset though. Because there are a bunch from Shimano chainsets to choose from that’s probably easiest. Shimano rings are good.
... um ... I actually have one of these (170mm) to flog. I did ~ 600km on it then had a problem with that frame.
< /shameless plug >
Friend has Ultegra 6800 setup and wants lower gears. 53/39 x 28T currently.
Ultegra 6800 cable RD, short cage version, what's the biggest cassette peeps have run?
Can you buy a longer cage for these or is it easier to just buy a long cage RD?
Anyone selling or best place to get Compact rings for 6800 cranks?