Front Hub Bearing: 139QMB Scooters

Smooth Rolling: High-Precision Front Hub Bearing Restore the handling and safety of your scooter with this High-Precision Front Hub Bearing . Specifically designed for the 10mm axle systems found on Chicago Scooter Company models and 139QMB (GY50) Chinese scooters, this bearing ensures low-friction rotation and a stable front-end feel. Whether you are experiencing wheel wobble, "grinding" noises, or performing a routine front-wheel service, this OEM-spec bearing is the standard for reliable urban commuting. Technical Performance Features OEM-Spec Geometry: Features exact 30mm OD / 10mm ID dimensions for a press-fit installation that matches the factory tolerances of your front hub. Dual-Shielded Design: Equipped with protective shields to keep road grime and moisture out of the internal raceways, significantly extending the life of the bearing. High-Speed Rated: Engineered to handle the RPMs and lateral loads of 10-inch and 12-inch scooter wheels at full city speeds. Low-Friction Performance: Reduces rolling resistance to improve fuel efficiency and provide a smoother, more predictable steering response. Comprehensive Fitment Guide This bearing is a direct replacement for the front wheel assembly of the following 50cc 4-stroke scooters: Brand / Manufacturer Compatible Models Chicago Scooter Co. Go, Go. MAX Chinese GY6 50cc 139QMB / QMB139 / GY50 Engine Platforms Popular Brands TaoTao, Wolf, Ice Bear, Bintelli (50cc Models) Technical Specifications Outer Diameter: 30 mm Inner Diameter: 10 mm Thickness: 9 mm Bearing Type: 6000 Series (Verify size on old bearing) Mechanic's Note: Wheel bearings should always be replaced in pairs to ensure even wear and balanced handling. When installing, never strike the inner race of the bearing; always use a Bearing Driver Tool or a socket that matches the diameter of the outer race to press the bearing into the hub. For the best results, clean the hub bore thoroughly and apply a light film of High-Temp Grease before installation. SKU: 0600-4003 MPN: 3500136 Front Hub bearing for CSC Go or 139QMB Chinese Scooter