Derailleur Arm – the arm which extends from your rear derailleur, with pulleys to feed the chain via. The derailleur arm is spring-loaded to eliminate slack with the chain when making use of smaller sized gears. Getting to grips with all different bike parts’ names usually takes a short while https://bikeengineskits25811.p2blogs.com/33887076/5-essential-elements-for-bike-parts-online