Hope EVO GR4 Gravity Brake Black Red Size:Front Finish: Nickel Chrome Vittoria Finish: Nickel Chrome They feature our ceramic TBT or Premium bearings and are protected with the highly water resistant X seals to keep the bottom bracket running smoothly Super smooth lever action and premium construction make controlling that power feel natural Increased lever hook for greater control and security during aggressive ridingNew dimple design improves comfort during hard braking and maintains grip in all weather conditionsNew cam design reduces free lever stroke while maintaining feel and modulation in the braking zoneMain Pivot: Roller bearingGuidance System: Two guide bushes keep the piston running smooth and straightBleeding: Bleed port added to the master cylinder body for bleeding without removing the lidCaliper Design: One piece caliper for optimal stiffness to weight ratioPistons: Larger pistons increase brake ratio for more powerStiffness: Improved caliper stiffness enhances lever feel and braking powerAdjustment Range: Increased range for better compatibility with third party hubs and frame combinationsBore Cap: New design reduces caliper width for easier packaging and improved frame compatibilityRotor Compatibility: Not compatible with vented rotors