Shimano Deore BR-M6220 4-Piston Brake Caliper Trail-Proven Stopping Power, Deore Price Four-piston stopping power at trail and enduro price points is exactly what the BR-M6220 delivers. The dual-diameter piston layout puts a smaller piston at the rotor entrance and a larger one behind it, stabilizing the rotor through the contact patch and cutting brake noise. The rigid two-piece caliper body keeps that power transfer direct and consistent. Heat-resistant resin pistons, updated piston seals, and low-viscosity mineral oil hold brake feel steady whether you're on a long alpine descent or a hot summer singletrack push. If you're upgrading a trail build or speccing a new one, this caliper brings four-piston performance where it belongs. Features Dual-diameter opposed-piston design smaller leading piston stabilizes the rotor at entry, larger trailing piston delivers maximum clamping force for controlled, powerful modulation Rigid two-piece caliper body stiff construction transfers braking input directly with minimal flex for precise feel at the lever Heat-resistant resin pistons with updated piston seals keep rebound speed consistent and brake feel stable on sustained descents Low-viscosity mineral oil maintains stable hydraulic performance across a wide temperature range, hot or cold Compatible with non-finned metal or resin pads works with current Shimano pad shapes for easy pad swaps Standard and 2. 2mm rotor compatible pairs with both regular rotors and the newer thicker 2. 2mm options including RT-CL750 and RT-6B750 | Shimano | Deore Br-M6220 4-Piston Brake Caliper Caliper Only, With D02S-Mx Metallic Pads