Part # 20-5
CVT Drive Belt
842-20-30(Above number is written on your original belt)
Length: 33.14 in.
Continuously Variable transmission (CVT) belts for all sizes of GY6 & QMB139 engine style scooters with automatic CVT engines. 50cc through 250cc 4-stroke engine sizes
842 (First number in the series) = The length of the belt in millimeters.
20 (Second number in the series) = The width of the belt in millimeters.
30 (Third number in the series) = The angle of the teeth on the belt.