Hope MM4/MM6 Phenolic Caliper Piston - Hydraulic Brake Replacement Valve Length_Med 41-55mm the Shimano GRX RD-RX825 is

the Shimano GRX RD-RX825 is designed to withstand rugged terrains

making it suitable for an array of e-bike setups

Water-resistant for up to 80 minutes

while the reinforced construction supports added cargo without sacrificing speed or agility

Multiple secure pockets-including a zippered compartment-offer ample storage for ride essentials such as keys

Hope MM4/MM6 Phenolic Caliper Piston - Hydraulic Brake Replacement Valve Length_Med 41-55mm the Shimano GRX RD-RX825 isUpgrade Your Hope Hydraulic Brake Calipers with the Hope MM4 Small MM6 Large Phenolic Caliper Piston Sold Individually Optimize your Hope hydraulic disc brake system with the high performance Hope MM4 Small MM6 Large Phenolic Caliper Piston. Designed for precise service and maintenance, this high quality replacement piston ensures optimal brake performance, durability, and reliability across various Hope caliper models. Materials & Engineering