Cassette: a group of stacked sprockets or gears over the rear wheel of the bicycle with a rear derailleur. There is usually anywhere from 5 to twelve gears in back on the cassette. For a UESCA-Licensed biking mentor, Rory loves biking in all its kinds, but is really a highway https://pitbikeengines72468.tblogz.com/top-latest-five-engine-bike-50cc-urban-news-48462385