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I'm worried about long and steep descents like 10% avg incline, 15km long, hairpins and blind curves. Not sure if you have tried something like that where you live :(. I got friends that do that with 140 front and rear, but they have a common weight/height, I'm 6'3" and trying to keep under 85kg, but like to recover descending what the midgets normally get away from me on the climbing.
It's true! I'm now running a 140mm rotor on the rear and it's stopping me (at 6'6" and almost 100kg) so it's not the end of the world for the kind of riding I do. I can skid if needs be, for sure.