Brake Assy - LEFT - 4.0 Inch Backing Plate and Shoes - Coolster 3050, 3125 101486 This is the gear box

This is the gear box cover for GY6 50cc 4-stroke scooters

Drive face hole diameter:  19

CAST Cylinder (aluminum also available)

Metal frame around entire windshield

Mounting tabs on the top and bottom

Brake Assy - LEFT - 4.0 Inch Backing Plate and Shoes - Coolster 3050, 3125 101486 This is the gear boxDrum Brake Assembly. Complete with backing plate, shoes and hardware. LEFT SIDE. This is a very popular drum brake backing plate assembly for atvs. Typically used with 6. 0 inch and 7. 0 inch tires. Fits many 110cc and 125cc ATVs. Please check the pictures and description before ordering. Backing plate details: Backing plate diameter: 104. 5mm (4. 12 in) Center hole inside diameter: 19. 6mm (0. 77 in) at top of hole Center hole inside diameter: 17mm