SRCV-18-669 18mm
 
This is the belt for almost all Chinese brand 49cc or 50cc 4 stroke scooters with 10 inch wheels
Other brands of 50cc 4 stroke scooters with engine number QMB139 or 139QMB etc and 10 inch wheel.
 
These belts also fit almost every Chinese 50cc (49cc) 4 stroke scooter (including  Ciclone, Meiduo, Fada, Sunny, JM Star, Meteor, 50QT, YYQT50, Huawin, Motostar, Baotian, Boatian, Solana, Arrow, Fierce, Forza, "Factory Built", Wolfboy, Qingqi, Kinroad, Lifan etc also other generic brands registered as "Moped" etc). If you own one of these scooters your original belt may have the code 669-18-30.
 
Honda dio AF35 (zx model)
The Honda af35 zx model needs this belt and will not work with the belts from the standard models such as AF34.
These scooters will also take a 18-664 sized belt.
 
Other belt sizes available;
Groove Angle: 30° 
15.5 - 650 
15.5 - 642 (interchangeable with 650) 
15.7 - 666 
16.6 - 792 
17 - 790 
17.5 - 710
17.5 - 765
17.5 - 845
17.7 - 729 
18 - 654
18 - 664
18 - 669 
18.5 - 675 
19 - 650 
20 - 815 
20 - 743 
20 - 842 
20 - 835 
 
Decent quality, we install these at JR Motorcycles workshop and highly recommend them.
Installation available in Rolleston, Christchurch.