On Shimano and SRAM derailleurs, the b-tension adjuster fine-tunes the height of the guide pulley. On Campagnolo derailleurs, the adjustment is done via a screw near the p-knuckle.

B etter late than never. A full decade after SRAM launched its game-changing wireless eTap system, Shimano has finally ...

Within the application, Shimano states: "While a bicycle travels on uneven terrain, it is possible for the chain guide of the rear derailleur to hit rocks, ground and so on.

Our expert has ridden every XTR group in history. He thinks the latest generation is quite good, yet one missing quality will leave you wondering if it’s truly next-level.

It looks complicated, but if you know how a derailleur works, you can fix many bike problems on your own.

Shimano is not yet talking about this clutch derailleur - which, notably, works with two chainrings - but BikeRadar talked to Trek-Segafredo riders and staff about their experience with the product.

Paul Townsend in the UK recently sent us his modification to a Shimano Ultegra Di2 rear derailleur, having set it up with a clutch mechanism to make it more reliable for single chainring (1X) use.