Hydraulic Cable Length:550mm/21.6'', Diameter Of Rear Mount Hole:15mm/0.59'' Distance Between Front Mount Holes(Centre Hole To Centre Hole): 40mm & 50mm Brake Disc Rotor Outer Diameter: 190mm/7.48"; Inner Diameter: 50mm/1.96'' Hydraulic Rear Disc Brake Caliper with Master Cylinder & Brake Pads Brake System For 110cc 125cc 140cc 150cc PIT PRO PIT Bike Trail Bike Dirt Bike Thumpstar with 15mm Rear Wheel Shaft Package Includes: 1x Hydraulic Rear Disc Brake Caliper + 1x 190mm Disc Rotor + 1 Pair Brake Pad + 4x Rotor Bolts + 3x Ties PRO BAT 15mm Rear Brake Caliper Master Cylinder+190mm Brake Disk Rotor+Brake Pad for 70cc 90cc 110cc 125cc 140cc 200cc Racing PIT PRO Dirt Bikes, Blue