Wold Ranger wrote:
Most race frames still come fitted with V brake bosses for this reason and why between 25 and 50 percent of most starters at Mtb races steer well clear of discs. Drag is a real problem
I don't claim to be an expert in anything but as a subscriber to modern magazines for some time not sure I have seen any bikes other than custom built either v or canti bosses and all races i have seen both reported on online or in publications are 99% disc brake if not more.
I used Clarkes disc brakes (s2) self fitted and I am a noob on disc and two years needed no adjustment and suffered no drag. Fit and forget.