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Yes they might be, they insisted that Shimano told them 140 would be enough and I assume that for "normal" people it could be... but not if the rider+bike+extras are about 100kg or more :(, and the road descents are as steep as they can get (like @hippy with full equipment for the TransAm)
bertocq
Howard
Bummer. 160mm rotor rear might be overkill for most though. It's what I have on my monster trail bike with Hope Tech X2s.