Use on front or rear Economical Great quality DIY & save money Brake drum shoe set with springs, with a diameter of 105 mm This size is used on several scooter and moped models, and the Baja Mini Bike MB165 & MB200 Brake drum shoe set with springs, with a diameter of 105 mm. This size is used on several scooter and moped models, and the Baja Mini Bike MB165 MB200. Outside diameter prior to installation is 105 mm, or about 4-1/8″. Can be used on the front or rear depending on the scooter or mini bike application.