GY6 50cc (139QMB) Scooter 669-18-30 CVT Drive Belt

669-18-30 CVT Drive Belt for 50cc 4-Stroke Scooters

This 669-18-30 CVT drive belt suits 139QMB short-case 50cc scooters that run on 10-inch wheels. It plays a central role in delivering power smoothly through the drivetrain. As one of the essential GY6 50cc scooter parts, it should be swapped out once you notice wear like cracking, glazing, or fraying. Models it fits include the CSC Go, Go MAX, Pug 50, Nitro Sport 50, and Bella Classic 50.

Construction and Design

The belt is built with aramid cord reinforcement, which gives it durability and resistance to heat. A nylon-faced cogged underside helps it run more quietly and bend more easily as it moves. Together these features are meant to keep it dependable under demanding use.

When to Replace Your Drive Belt

It's worth checking your drive belt on a regular basis. Watch for visible damage, such as cracks or fraying. When either appears, replacing the belt will help keep your scooter performing well and riding safely.

Specifications

• Material: Aramid cord, chloroprene rubber, nylon tooth fabric
• Size: 669-18-30
• Circumference: 669mm
• Width: 18mm
• Angle: 30°
• Country of Origin: China
• Fits: CSC Bella Classic 50, CSC Go MAX and CSC Nitro Sport 50 (139QMB short-case 50cc, 10-inch wheels)

Fitment

Fits:

• CSC Bella Classic 50 (139QMB short-case 50cc, 10-inch wheels)
• CSC Go MAX (139QMB short-case 50cc, 10-inch wheels)
• CSC Nitro Sport 50 (139QMB short-case 50cc, 10-inch wheels)

How to choose: Check the belt size stamped on your current belt and match it to 669-18-30. Long-case 139QMB engines with 12-inch wheels use a 729mm belt instead.

Where it goes: Part #6 on the transmission diagram for the CSC Bella Classic 50; part #6 on the transmission diagram for the CSC Go Max; part #6 on the transmission diagram for the CSC Nitro Sport 50.

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