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The Shimano XTR Disc Brake Adapter (ISMMA90R180PS) is designed for serious mountain bikers and mechanics looking to upgrade their stopping power to 180mm rotors on frames featuring International Standard (IS) mounts. This high-end component offers a seamless interface between 74mm-caliper brakes and IS frames, providing the reliability of the XTR series; however, users should ensure their frame and fork clearance can accommodate the increased rotor size before installation.
| Series | XTR |
|---|---|
| Model Part Number | ISMMA90R180PS |
| Brand | Shimano |
No, this specific model (ISMMA90R180PS) is engineered specifically for rear IS frame mounts.
This adapter is designed for Shimano 74mm-caliper brakes. While it may fit other brands, perfect alignment is only guaranteed with Shimano systems.
The adapter typically includes the necessary hardware, but ensure your frame mounts are clean and threads are in good condition.
It allows you to run a larger 180mm rotor on an IS frame, providing increased cooling capacity and braking leverage.
Yes, this adapter is specifically designed for use with XTR M985 and M988 disc brakes.
Loosen caliper bolts, squeeze the brake lever firmly, and re-tighten bolts while the lever is held to auto-center the caliper over the rotor.
Verify that all mounting bolts are tightened to the correct torque and check the rotor for true alignment.
Installation requires a 5mm hex wrench to secure the adapter to the IS frame tabs and the caliper to the adapter. Always ensure that the mounting bolts are tightened to the manufacturer's recommended torque specifications to prevent vibration or loosening. Compatibility is limited to frames with rear IS mounts and Shimano-standard 74mm post-mount calipers. To maintain the component, periodically check for debris buildup around the cutouts and ensure that the mounting bolts remain tight after the initial "bedding-in" period for new brake pads.
