Bicycle derailleurs - MTBIKER.shop

The rear derailleur is part of the bike's drive system, it is responsible for shifting the chain between the different gears on the rear cassette. This precision device plays a key role in ensuring smooth and efficient gear changes, allowing cyclists to adapt to different terrains and optimize pedalling cadence. Choosing the right rear derailleur for a bicycle is important, and the following features must be taken into account:

Bike type: Different types of bikes (road, mountain, hybrid) have specific requirements for rear derailleurs. Make sure the derailleur is compatible with the bike frame.
Compatibility: Make sure the derailleur fits your cassette size and is compatible with the shifter.
Weight: Consider the weight of the derailleur, especially for racing bikes.
Reputable brands: Opt for renowned brands known for quality and durability such as Shimano, SRAM or microSHIFT.
Maintenance and service: Consider ease of maintenance and availability of spare parts. A derailleur that is easy to set up and service can save you time and money in the long run.

If you consider these factors, you will be better prepared to choose a rear derailleur that suits your bike, riding style and preferences.

How does the derailleur work?

The derailleur is connected to the lever by means of a cable. As the rider operates the lever, the cable tension changes, causing the derailleur to shift the chain to a different gear. The derailleur has guide pulleys and a shoulder that control the movement and adjustment of the chain on the cassette.

What are the main differences between road and mountain bike derailleurs?

The main differences between road and mountain bike rear derailleurs are as follows:

Gear range: MTB derailleurs usually have a larger gear range compared to road derailleurs. This is because mountain biking often involves steeper climbs and uneven terrain, which requires lower gears to climb. Road derailleurs are designed for higher speeds on smoother surfaces and generally have a narrower gear range.
Length of chain link: MTB derailleurs typically have a longer chain link compared to road derailleurs. This longer chain stay accommodates a larger range of mountain bike gears, allowing for more chain slack and the ability to work with larger chainrings and cassettes. Road derailleurs typically have shorter cages to accommodate smaller gear ranges and maintain tighter chain tension.
Shift speed: Road derailleurs are usually designed for faster shifting, as road cycling frequently involves rapid gear changes during sprints or attacks. MTB derailleurs may have a slightly slower shift due to the need for more precise and reliable shifting, especially in difficult off-road conditions.
Durability and protection: MTB derailleurs are built to withstand tough off-road conditions, with stronger materials and additional impact protection. Road derailleurs prioritize weight savings and aerodynamics, which can make them more susceptible to damage in rough terrain.
Clutch mechanism: Many modern MTB derailleurs are equipped with a clutch mechanism that improves chain holding, especially on bumpy roads. This feature is not commonly found on road derailleurs, as road cycling involves riding on smooth surfaces and saving weight.

Is it necessary to lubricate the derailleur?

In principle, it is not necessary to lubricate the teeth of the pulley on the derailleur, it is important to lubricate the chain. As for the derailleur, it is sufficient to lubricate the pulley sliding bushings during regular drive service.

Check out our video How to set up a rear derailleur