Drive Belt 49cc QMB139 Scooters

Not sure which belt your scooter needs? 🛵 The easiest way to figure it out is by confirming whether your scooter uses a short case, long case, or extra-long case setup — and what size wheels you have.

• 🔍 Short case = 10" wheels
• 🛞 Long case = 12–13" wheels
• 🔥 Extra long belt available for Maddog builds

The Details ⚙️

Most Chinese 49cc scooters use the QMB139 engine — and belt sizing depends on the transmission case length. Wheel size is the easiest way to determine what you have, but you can also verify by checking the engine stamping.

The engine code will be stamped near the center stand pivot on the left side of the case. If it says QMB139, you're in the right place — this guide applies to your scooter.

Once you confirm the case style, selecting the correct belt becomes easy and avoids premature wear, slipping, or poor performance.

What's Included 📦

This listing is for reference and sizing guidance only — belts are sold separately by selected size.

Fitment 🔍

• All Chinese 49cc scooters using the QMB139 engine
• Short case (10" wheels)
• Long case (12–13" wheels)
• Extra-long case (commonly TaoTao Maddog / stretched builds)