Hi,with any clipless pedal setup is crucial,up until this year I have been doing about 15000miles a year on spd sl road pedals and spd mtb pedals,I have used other brands but they don't seem to last as long.Make sure the ball of your foot is over the pedal axle and that your feet are positioned how they hang naturally,also take into account your saddle height,too high and you'll be stretching for the pedals causing your knees to twist.Hope this is helpful,why have I cut back on the mileage this year? Knee surgery,doh!