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A bike derailleur is an important feature in any geared bicycle. It has sprockets of different sizes and a mechanism that shifts the chain between different sprockets to create a gear shift. If you need a replacement derailleur gear system, be sure to note whether your new derailleur is for the front or back to ensure it will fit your bike.

Derailleur Gear

Without functioning derailleur your bike won’t function properly. They will get sticky and dirty over time but if you clean and lubricate the derailleur and still have little effective movement, it may be time for a replacement. The right replacement may need to be very similar to your existing component or you may be able to switch for an upgrade.

Mountain Bike Derailleur vs Road Bike Derailleur

The main difference you’ll find between road bike and MBT derailleur is the length of the rear derailleur component. Mountain bikes have lower and wider spaced gears usually and this means the rear derailleur needs to be able to handle a bigger span in change length than standard road bike derailleur

Bike Derailleurs at Decathlon

We stock a great range of front derailleursandrear derailleursto suit many models and types of bike. We’ve also got everything else you could need to keep your drivetrain in top condition includingbike gear shiftsand generalbike parts for maintenance and upgrading your wheels.