Brake Disc Center Rotor Block with Steel Bolts 160mm 180mm 203mm Bicycle Rotor Discs for Road Bike, Mountain Bike, MTB, BMX

1.Size: 20"*4.0" 2. The length of the front fork vertical pipe is 252MM and the open file 135MM 3.Weight: 2120g 4. Dedicated to disc brake, support oil pressure disc brake 5. Material: magnesium alloy fork leg/fork shoulder, aluminum alloy tube/shock tube