Derailleur Arm – the arm which extends from your rear derailleur, with pulleys to feed the chain through. The derailleur arm is spring-loaded to eliminate slack through the chain when making use of smaller gears. Shock absorber: for bicycles with suspensions, a tool which is part of the front fork https://bike-engines-kits72697.laowaiblog.com/33963764/top-latest-five-go-kart-urban-news