The Shimano Pulley set (RD-M780) is the genuine replacement set for selected Shimano 10-speed DYNA-SYS rear derailleurs used on mountain bikes and trekking bikes. If your current jockey wheels are worn, noisy or showing extra play, swapping them out is one of the simplest ways to bring back cleaner drivetrain running and more consistent shifting feel.

This set includes one guide pulley and one tension pulley, so you can replace both wear items together rather than mixing old and new parts. The pulley design used here pairs a sealed-bearing tension pulley for low-friction running with a ceramic-bushed guide pulley aimed at long service life, which makes it a smart choice for bikes that still see regular trail, touring or commuter kilometres.

For buyers keeping an older XT or trekking 10-speed Shimano drivetrain going, this is the right sort of part: genuine fit, no guesswork on pulley sizing, and compatibility that matches the listed rear derailleurs. It’s a practical workshop fix when your derailleur still works well overall but the pulleys have reached the point where they’re affecting noise, chain control or shift accuracy.

Ideal for riders maintaining a compatible Shimano 10-speed MTB or trekking bike who want the correct genuine pulley set instead of an aftermarket substitute.