Originally Posted by slimlavud

It means get yourself a proper bicycle with gears so that I don't have to pay for your knee operations/wheelchairs when riding your single speed (almost always at the wrong cadence and too much strain) renders you a cripple in the future...
P.S. I am 52 ride 20 miles per day across London (on a 15-speed tourer) and see a lot fixed/single speed amateurs new to cycling who are putting their knees etc under too much strain - 90-110 is the right cadence - watch racers, they don't struggle away in the wrong gear...