Derailleur Arm – the arm which extends in the 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. We're excited about what we do, no matter if It really is sharing our insider https://bikeengineskits05919.bloginder.com/35642618/little-known-facts-about-cassette-bike-part