The Hope GR4 is a four-piston gravity brake for the most demanding applications delivering maximum power with no compromise. Super-smooth lever action and premium construction make controlling that power feel natural. The benchmark brake for gravity and e-bike use.Increased lever hook provides greater control and security during aggressive riding while a new dimple design improves comfort during hard braking and retains grip in all weather conditionsNew cam design decreases the free lever stroke while maintaining the feel and modulation in the braking zoneFeatures a roller bearing main pivot and 2 guide bushes to keep the piston running perfectly smooth and straightOne-piece caliper design for the best stiffness to weight ratio that results in improved lever feel and increased power (NOTE: GR4&';s are not compatible with vented rotors)Larger pistons increase the ratio of the brake for more powerNew bore cap design decreases overall width of the caliper for easier packaging and better frame compatibilityLarger adjustment range for better compatibility with third party hubs and frame combinationsBleed port added to the master cylinder body enables bleeding without removing the lid TECH SPECS table{border-collapse:collapse;width:auto;max-width:100%;} td{text-align:left;padding:12px;font-weight:350;word-wrap:break-word;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Brake Lever Actuation Hydraulic Brake Caliper Type Post Mount Rotor Included No Brake Lever Use Right Color Silver/Blue Hydraulic Fluid Type DOT Pad Compound Organic Adjustable Reach Yes Adjustable Contact Point Yes