The Sram Guide RE disc brake has been designed to meet the demands of eMTB. Sram have upgraded the standard Guide R by using a downhill caliper from the Code brake. They’re designed to handle the higher average speeds and harder use when using an e-bike.   Guide RE is Sram's optimized braking solution for today's exciting category of eMTB's, capable of handling the higher average speeds, more intense use and increased mass due to the presence of the motor and battery.   It combines Sram's proven Guide R lever assembly with a powerful 4-piston caliper derived from the gravity-focused Code brakes. Guide RE provides real, usable on-trail control—optimal power and modulation mean speed can be controlled in all terrain and in all situations, both uphill and downhill.   Specifications Brake Type: Hydraulic. Blade Material: Aluminum - Stamped. Contact adjust: No. Orientation: Front, Rear. Pad Type: Steel-backed organic. Bracket: Direct mount DIR. Reach adjust: Tool-free. Hydraulic Fluid: DOT 5.1.