Cassette: a group of stacked sprockets or gears about the rear wheel of the bicycle with a rear derailleur. There can be between 5 to 12 gears in back on a cassette. Attending to grips with all the several bike parts’ names can take a couple of minutes for novices https://bike-engine-details77642.blogsuperapp.com/35546640/the-5-second-trick-for-engine-bike-oil