Cassette: a bunch of stacked sprockets or gears over the rear wheel of a bicycle with a rear derailleur. There is usually anywhere from 5 to twelve gears in back with a cassette. Our motorized bicycle kits are universally suitable to fit Virtually any 26" men's bike, and with a https://pitbikeengines82580.actoblog.com/35679328/the-5-second-trick-for-engine-bike-oil