The +40 mm disc brake adapter is CNC-machined from high-strength aluminum alloy, providing a lightweight yet reliable solution for upgrading to 160 / 180 mm rotors on both front and rear wheels. Engineered for Post Mount to IS compatibility, it works seamlessly with top brake systems from Shimano, SRAM, Tektro, Magura, Avid, Hayes, and others. A full hardware kit (adapter, bolts, spacers) is included for a hassle‑free installation. Please confirm your frame or fork mount type prior to purchase, as some setups may need additional spacing.