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New product -42%Rear derailleur shimano deore rd-m6100-sgs 12s- €38.27
- €65.99
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New product -20%Rear derailleur Shimano XT RD-M8050 DI2 GS 11s- €311.99
- €389.99
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New productRear derailleur S Ride RD-M200 6 to 8s- €16.99
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New product UsedMTB rear derailleur Sram NX1 11s- €29.44
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New productRear derailleur Shimano XT RD-T760- €39.99
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New productMicroshift derailleur 7 to 8s- €10.99
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UsedMTB rear derailleur Sram XX1 11s- €88.99
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New product -70%Sram X0 rear derailleur hanger protection North Shore Billet- €12.00
- €39.99
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New product -20%Demi cage external Shimano XTR M980 SGS- €15.96
- €19.95
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New product -50%Tension & guide pulley set BBB for Campagnolo and Shimano 11s- €10.25
- €20.49
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New product -55%Rear derailleur Sunrace M41 7s long cage- €9.00
- €19.99
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UsedRear derailleur shimano slx 11s- €29.99
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More detailsNew product Out-of-StockRear derailleur Shimano deore lx 8s- €59.99
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More detailsNew product -30% Out-of-StockShimano electric cable Di2 EW-SD50- €25.19
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More detailsUsed Out-of-StockSram X9 rear derailleur long cage- €49.99
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Everything you need to know about the MTB rear derailleur: features and specifics
The MTB rear derailleur is an essential part of your mountain bike’s drivetrain. Acting as the conductor of your gear system, it ensures smooth and precise shifting, allowing you to adapt efficiently to the varied terrains encountered on your rides.
What is an MTB rear derailleur ?
The rear derailleur, often simply called the “derailleur,” is a mechanism attached to the bike frame near the rear wheel. It guides the chain from one cog to another, controlling the gear ratio. Unlike the front derailleur, which manages the chainrings, the rear derailleur handles the rear gears, making it crucial for maintaining an efficient and comfortable pedaling rhythm—whether climbing, tackling technical trails, or riding on flat terrain.
Key features of an MTB Rear derailleur
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Number of Speeds
The rear derailleur must match the number of cogs on your cassette. Today, 12-speed systems are common on modern MTBs, but 10- or 11-speed models still exist for older transmissions. -
Chain Capacity
This indicates the maximum difference in teeth the derailleur can handle between the smallest and largest cogs. Adequate capacity is essential to prevent chain drops or jams during shifting. -
Cage Type
The cage is the part that holds the lower pulley. There are short cage derailleurs, ideal for bikes with fewer gears, and long cage derailleurs, suited for wide-range cassettes and enduro or trail MTBs with significant gear span. -
Compatibility with Drivetrain Type
MTB rear derailleurs are designed for either mechanical (cable) or electronic drivetrains. Electronic models offer faster and more precise shifting but are more expensive. -
Spring Tension and Geometry
Spring tension and derailleur hanger angle affect chain stability, especially on rough terrain. Modern models often include a clutch system to reduce chain slap and improve control.
Specifics according to MTB type
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Cross-Country (XC) MTB: Focuses on lightweight components and quick shifting, with short-cage derailleurs and simple, efficient systems.
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Trail / Enduro MTB: Requires robust derailleurs, often with long cages and a clutch system, to handle jumps and technical terrain while keeping the chain stable.
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All-Mountain / Downhill MTB: Prioritizes durability, with reinforced components able to handle wide-range cassettes and extreme riding conditions.
Maintaining your MTB rear derailleur
To keep your MTB drivetrain performing at its best, regularly clean the rear derailleur, lubricate the chain, and check the derailleur hanger alignment. A misaligned derailleur can cause imprecise shifting, chain noise, or even chain drops.
Conclusion
The MTB derailleur is more than just a drivetrain accessory—it ensures smooth and precise riding, adapting to terrain changes and rider needs. Choosing the right model and keeping it properly maintained is essential to fully enjoy every ride, whether you’re XC racing, enduro riding, or hitting downhill trails.