Rear Sprocket #420 37th
Bolt Pattern=4x90mm (64mm to adjacent hole), Shaft=58mm
Most Chinese Dirt Bikes

Common applications include:
Apollo 50cc
Apollo 70cc Kiddy
Baja DIRT RUNNER DR125
Baja DIRT RUNNER DR49
Baja DIRT RUNNER DR50
Baja DIRT RUNNER DR70
Baja DIRT RUNNER DR90
Baja WARRIOR 90
Baja WARRIOR WR49
Coleman Powersports 70cc
Coolster 110cc QG-213 & QG-213A
Coolster 70cc QG-210
Coolster 70cc QG-210X-70
Peace Sports 70cc XB21B (TPGS-109)
TaoTao ATD-90A
TaoTao DB10-110cc
TaoTao DB14-110cc