Bike Rear Derailleur
There are many different models but they all share the same basic design and functionality. Just as the name states it is usually found at the rear end of the bicycle.
The rear derailleur may have to change between eight or nine and possibly even eleven cogs on the back wheel.
Bike rear derailleur. There are exceptions from these rules so if some combining mix matchin is planned it is best to first read the post about bicycle rear derailleur compatibility. Different cable pull ratio and parallelogram movement for each. Also known as a rear mech a rear derailleur is the mechanism responsible for moving the chain consecutively cog after cog of the cassette.
The larger cassette demands a different configuration than the smaller cassette on the front. The rear derailleur is the mechanism that shifts the chain at the rear sprockets. A rear mech derailleur hanger is a sacrificial part of a bicycle designed to deliberately break in order to prevent damage to the main bike frame.
The highest gear smallest sprocket on the rear derailleur is actually the point of lowest cable tension meaning the derailleur is doing the least work and is thus easiest to adjust. Rear derailleurs are a tool that provides the mechanism which shifts the chain from one cog to another on your bicycle s cassette that is located at the rear. 10 and 11 speed mtb derailleurs as well as 11 speed road bike derailleur are not interchangeable.
Also known as derailleur hangers gear mech hangers and frame savers a rear mech hanger is a relatively cheap and essential piece of equipment for anyone who is serious about their cycling. Almost all modern mountain bike derailleurs and shimano s grx gravel groupsets ultegra rx rear mech sram s single ring road groupsets and etap axs 12 speed road rear mechs include a clutch. The handlebar s gear shifter of the bike tugs on a cable which actually moves the derailleur.
They ve come a long way since. When you re purchasing a derailleur make sure you know if it is a front or rear derailleur as they are not interchangeable. The gear shifter at the right hand of the handlebars propels the cable to move the derailleur which.
While pedaling the bike locate the cable leading to your rear derailleur and pull on it gently. The best mountain bike derailleurs today are durable easy to tune and can shift smoothly even under load. Your rear derailleur is a technological marvel.
First invented in 1906 it was clunky unpopular and had two speeds. The derailleur is moved by tightening or relaxing the cable tension. Derailleurs are secured to the bike with a mounting bolt to the frame s derailleur hanger.
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