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@bertocq
@hippy I was worried about the rotor size too, and talked to other club riders that use discs and compete in really hard climbs/descents like the Angliru in Asturias, all of them use 140mm rotors, but weight 1/3 less than me (85kg), and only one is thinking about getting 160 in the front.
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You can see Chechu Rubiera descending with discs vs rims here
https://www.youtube.com/watch?v=9qqiohJGM98
Since my Kinesis 4S can't handle a 160mm rear rotor (because they have retarded designers or bad welding batches), I looked at the Shimano Freeza rotors but my wheels got 6 bolts mount instead of centerlock... So after searching alternatives I've bought a pair of 140&160 Reverse Aircon:
