## Rear Gearbox 16/52 Complete Set 139QMB/QMA(GY6 50) 4T - Durability and Reliability for Your Scooter This complete rear gearbox 16/52 for 139QMB/QMA (GY6 50) 4T engines guarantees smooth and efficient operation of your scooter. Designed for durability and reliability, it offers precise gear ratios, which translates to better performance and riding comfort. ### Detailed Specifications and Advantages: **Clutch Shaft:** * Total length: 155 mm * Thread: M10 * Thread length: 12 mm * Shaft diameter: 17 mm * Mill diameter: 12 mm * Number of cutters: 22 * Diameter of cutters: 24 mm * Number of teeth: 16 * Bearing diameter: 12 mm **Output Shaft:** * Total length: 128 mm * Thread: M16 * Thread length: 25 mm * Cutter diameter: 20 mm * Number of cutters: 19 * Bearing diameter: 17 mm **Drive Shaft with Teeth:** * Total length: 56.5 mm * Wheel diameter: 69 mm * Wheel width: 10 mm * Number of teeth: 52 * Wheel diameter: 27 mm * Number of teeth: 15 * Bearing diameter: 12 mm **Cogwheel:** * Diameter: 81 mm * Width: 15.5 mm * Number of teeth: 51 * Number of cutters: 19 **Sealers:** * 27-42-7 * 17-30-5 ### Investing in Quality By choosing this gearbox, you are investing in solidity and longevity. Precisely manufactured components guarantee optimal gear ratios and minimize power loss, which translates to better performance for your scooter. The set is easy to install and perfectly fits 139QMB/QMA (GY6 50) 4T engines.