Low-cost front brake disc, Asian-designed. For everyday use on untuned vehicles. Worn brake pads cause extreme wear to brake discs. Braking performance drops and brake pads need replacing again after only a short time. This seriously hinders ride safety. The only answer is to change the disc. Suitable for vehicles with a diameter of 155mm and 3-point mounting. This is generally on all 50cc machines with 10” wheels. Internal diameter = 40.5mm. For added assurance, check dimensions and reference image. Always fit new brake pads to a new disc.