We highly recommend using the 10-inch brake rotor for racing lawnmowers if they have the ground clearance to do so. The 10-inch brake dadd mechanical leverage to the brake in the same way length increases leverage on a breaker bar. This gives the brakes more potential for stopping and locking up the rear wheels. Smaller brake rotors such as the standard 7.125?? diameter dmay not have enough leverage to slow heavier, faster machines.
Product Specs:
10″ OD
3/16″ Thick
(6) 1/4″ Bolt Holes on a 5/16″ Bolt Circle