Rear

Thanks to the new design of the parallelogram, the rear derailleur is now lighter and more rigid, with the most effective and fastest shifting.
The design is derived directly from the 11-speed components with the oversized outer plate to provide greater

Bringing constant refinement to the 11-speed XT drivetrain, the Shimano XT RD-M8000 Rear Derailleur offers improved chain retention when you're riding across jarring, rock-strewn trails. Benefiting from trickle-down technology from the XTR group, Shadow R

Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel (OSPW) System for Shimano 9000/6700 provides the ultimate optimization of your bicycle's drivetrain.

This OSPW System features a set of 17-tooth aluminium Pulley Wheels, availa

Shimano TZ500 6-speed rear derailleur (direct attachment)
SIS rear index shifting
GS cage can handle wide range gearing and 28 tooth sprockets
11 tooth pulleys offer long service life and less noise
Wheel type cable guide provides super light shifting

It doesn't matter if you value a lightweight climbing bike or an aero speedster, drivetrain friction causes drag at any speed, and thus more watts if you want to go faster. And while it's harder to quantify frictional losses compared to say, aero data in

Developed and designed entirely by CeramicSpeed the Oversized Pulley Wheel System for Campagnolo is advanced for the optimization of bike performance. Everything from bearings to the cage is made from the highest quality materials. The oversized aluminium

Direct mount
Rear capacity: 23T
Max front difference: 22T
Total capacity: 45T
Steel outer & inner links
Steel outer & inner plate cage
11T (bushing) guide pulley
11T (bushing) tension pulley
9 speed
Composite plate body
11-34T
11T tension pulle

New mechanical Record™ 12 Speed rear derailleur: precision, lightness and versatility.

Designed to improve performance and function in every aspect, the new Record™ 12 Speed mechanical rear derailleur has an innovative shape that envelopes the sprocket

Product Description
SRAM’s Apex 1 drivetrain gives the gear range and the shifting simplicity to let you simply go where you want. The Apex 1 rear derailleur makes that gearing choice a reality with clean, crisp shifts, thanks to SRAM’s X-Horizon™ geomet

11t Jockey wheels, Fits 105 11speed , can be fitted to Ultegra 11speed

RD-5800 105 11-speed rear derailleur, SS, for low gear 23-28T, black

Shimano 105 R7000 Series will empower more riders than ever before to embrace the sport of road cycling. It will become the supportive groupset that beginner riders choose to help them train for, and ride in more serious races. By combining trickle down t