My new cx/gravel build is 2x hydro ultegra shifter based. The ultegra front mech is bottom pull. The frame has a braze on for a pulley to deal with this but will any top pull front mech work (xt mtb double worked fine with 10 speed 105 brifters)- I will be using Middleburn cranks spiders and rings.
Is the CX70 designed to give better tyre clearance than a standard road front mech?
I don’t think it’s designed with the intention of giving better tyre clearance, rather to work better with smaller chainrings, like cyclocross chainsets, where the need to position the mech lower down the seat tube may result in a standard mech hitting the chainstay when changing to the small ring. I guess the design might possibly also result in better tyre clearance.
Couple of photos here of the mech (first one bottom pull version):
The issue isn’t tyre clearance, but chainline but I’ve run up to 40mm tyres with a road chainset without problems – if the XT mech worked fine previously then don’t see an issue – why don’t you try it? Top pull is preferable for muddy conditions as pulley’s tend to cause more cable drag and cause mud to collect IME.
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