Welcome to the new and improved Proflex / K2 Tech Forum!
Not long after getting an overhaul at my local lbs I could only ride my bike for about 50 metres before the back wheel would rub on one brake block or the other.So off I jump only to find that on turning the wheel the problem would right it self and the wheel was centred with no play.Jump on ride 50 metres and wheel would rub again......wtf....ride a few metres and stop...hmm threres a bit of play now.Turn the wheel slowly ...wow thres heaps of play now...enough to allow the wheel to rub on the brakes......turn the wheel another few revs...problem gone.....what was the problem?