Originally Posted by worker4youth
Don't knee problems occur also when you're mashing up a hill? That's pretty much unavoidable on a single-speed, except to avoid the hill altogether.
Small gear and SPINNNNNNNNN. With the freewheel came all those gears. Those big one's that are suposed to be for going down hills, are the ones that destroy knees when used incorectly. People that can't spin well just go for a bigger gear and mash the knees.