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@CasaSteve
Tester, while I have your attention, could you advise on compatibility between 105 5600 and Tiagra 4600? I'm assuming, for instance, a Tiagra long cage 4600 mech would work fine with 5603 STIs?
I've been reading around a little and have seen mention of pull ratios. I'm a little confused as to what will work with what...