DISC BRAKE ADAPTER, MA90, FOR 160MM ROTOR

Product Information

For cyclists looking to modernize their ride, the Shimano SM-MA90 Disc Brake Adapter effectively bridges the gap between older International Standard (IS) frame mounts and contemporary 74mm post-mount calipers. This particular adapter is designed for the rear, enabling the use of a 160mm rotor, which is a common choice for rear brake setups on many cross-country and trail bikes. Crafted from aluminum alloy, it features strategic machining to reduce weight without compromising the rigidity essential for consistent braking performance.

The MA90 series stands out with its refined design, including curved edges and machined windows, setting it apart from bulkier predecessors. It integrates alignment markings to simplify correct installation, ensuring optimal pad contact and rotor tracking. The included stainless steel mounting bolts come with a safety wire, a detail borrowed from high-performance applications, to prevent loosening under vibration.

Features

• Converts IS2000 rear frame mount to 74mm post mount caliper
• Optimized for 160mm rear rotors
• Lightweight aluminum alloy construction with weight-saving cutouts
• Anodized black finish for corrosion resistance and aesthetic integration
• Includes stainless steel mounting bolts with safety wire for secure fastening
• Stamped alignment markings for precise installation
• Compatible with all Shimano 74mm post-mount brake calipers

Specs

• Weight: 26 grams
• Material: Aluminum alloy
• Mount Type (Frame/Fork): IS2000 (International Standard)
• Mount Type (Caliper): Post Mount (74mm)
• Rotor Compatibility: 160mm (Rear)