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16,64stones here (had to google it to be able to understand how many stones you need to express 106kg of weight). And going down 10-15% descents, (and up) with a ~90kg rider + 16kg of bike and equipment. Front 160 for sure, but back... 140 is more than enough (with mech disc brakes), even under snow and wet conditions north-alike... but technique is also important. In the pictures, there is no water (2liters ~ 2kgs) or food in the bike... shoes and helmet count too
im going to 160mm discs. denied it for too long but 140 isn't powerful enough for someone at 14 stone who rides in the mendips a lot
lightest/best post mount adapters? best non-shite discs in 160mm? not convinced by these ultralight discs, warp easily and absolutely eat through pads