Transmits camshaft movement on the engine’s intake and exhaust valves. Amongst its finishes is guided from the lobe in the camshaft while its other conclusion pushes the valve (spring-loaded) to open up. Hub: the middle part of the wheel that contains bearings and is particularly in which the spokes attach https://bike-engines-explained60368.shoutmyblog.com/34202695/not-known-details-about-mountain-bike-parts