Shimano's RT-6B750 steps up rotor durability with a beefier 2.2 mm thickness, thicker than the standard 1.75 mm, extending service life and delivering more consistent power. The diameter lineup shifts with it: 203 mm becomes 200 mm, previewing a change coming across the Shimano rotor range, while the 220 mm option remains the top dog for maximum stopping power. Features More power: The 220 mm spec provides the highest braking power in Shimano's rotor lineup, with improved modulation More robust: A 2.2 mm-thick stainless-steel rotor adds strength, improves heat capacity, and better withstands impacts from trail debris. More consistent: Longer life than standard 1.75 mm thickness rotors. Versatile: Both 200 mm and 220 mm sizes are compatible with the newest generation of Shimano's 4-piston brakes. Specs: Series: XTR, Deore XT, Deore Model ID: RT-6B750 Mount: 6-bolt Thickness: 2.2mm Sizes: 200mm, 220mm Compatibility: The new thick rotors are fully compatible with Shimano's latest 4-piston brake system, including XTR M9220, Deore XT M8220, and Deore M6220.