Amperbike 18T Ceramic Jockey Wheel – AL7075 CNC Rear Derailleur Idler

Lightweight 18T ceramic‑bearing jockey wheel designed for high‑performance MTB and road bike rear derailleurs.

• High‑strength AL7075 CNC‑machined aluminum alloy – durable yet light.
• Ceramic bearings: super‑lubricated, low friction, long life.
• Fits 4 mm, 5 mm, or 6 mm roller screw axis; compatible with 7‑11 speed systems.
• Easy install – replace original pulley with same or smaller size.
• Available in colorful finish; matches most rear derailleur models.