Cassette: a group of stacked sprockets or gears to the rear wheel of the bicycle with a rear derailleur. There could be between 5 to 12 gears in again on a cassette. The seatpost may be the part that connects the saddle to your frame. It permits height adjustment and https://martinzuiqd.ourcodeblog.com/35218554/everything-about-chair-lift-service-and-repair-near-me