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I doubt it. I'm running 160s on my 'road' bike, but weigh around 115kg. There's the usual arguments for better heat-dissipation on long ( alpine long ) descents and a supposed difference in feel.
You're planning on running Shimano hydraulics, aren't you? I expect 140s would be fine. Maybe a 160 up front at the most.
BareNecessities
I know, I know I'm too fast but anyone actually know if there's a noticeable difference?
Do I really care about rotor size?