The Magura QM40 is a disc brake mounting adapter for running a 180mm rotor on a 160mm post mount — a +20mm step up. A simple, direct-fit way to upgrade to a larger 180mm rotor on post-mount forks.

• Adapts a 160mm post mount to a 180mm rotor (+20mm)
• Genuine Magura mounting hardware included
• Designed for Magura MT-series calipers