Ok, so....my Canyon Endurace came with full Ultegra Di2. Great bike but it had a really annoying compact chainset with an equally annoying 11-32 cassette.
I've recently changed the cranks to semi-compact (purchased on here - thx!) and just upgraded the cassette to a DA 11-25 (over 100g lighter!....£90 from Merlin fyi) and coupled these with a new KMC X11EL chain.
All good then....(or should be anyway)
Visually it looks fine....BUT....the shifting is slightly off and no amount of adjusting the rear mech has it shifting like it did before. The mech hanger is perfectly straight as is the rear mech
So... could this be a chain length problem, or, perhaps my rear mech needs changing? Maybe I need a short cage for an 11-25?
Or what exactly?