Product: Metal Flywheel for Electric Scooter and Bicycle (4hole, no teeth) Key benefits Durable metal construction reduces wear and extends service life compared with plastic parts. strength metal thread resists stripping during installation and maintenance. Direct replacement for compatible deceleration sprocket systems to restore smooth operation and stable performance. Simple, bolton design with four mounting holes for quick, reliable installation. Features and specifications Material: Metal flywheel body with strength metal thread. Compatibility: Works with electric scooter deceleration sprockets 54 (T8F), 55, 65, 80 (25H), etc. Suitable for use on electric scooters and bicycles that accept these sprockets. Mounting: 4 holes. Dimensions: Inner diameter: approx. 34 mm (1.3 in) Outer diameter: approx. 78 mm (3.1 in) Thickness: approx. 15 mm (0.6 in) Hole diameter: approx. 6 mm (0.2 in) Hole pitch (centertocenter between adjacent holes): approx. 46 mm (1.8 in) Diagonal center distance (between diagonal holes): approx. 65 mm (2.6 in) Design: No teeth on the wheel; intended for deceleration/pulleystyle applications. How it solves problems Replaces worn or damaged flywheels to eliminate wobble, slipping, or unstable deceleration behavior. Metal construction and strong threads reduce the risk of fastener failure during use or servicing. Standardized hole pattern and dimensions make it easy to verify fit before and speed up installation. Practical use scenarios : a worn flywheel on an electric scooter that uses a deceleration sprocket (e.g., T8F or 25H types) to restore stable braking and drivetrain alignment. Maintenance/upgrade: Keep as a spare part for service shops or toolkits when maintaining scooters or bicycles that share compatible sprocket standards. Custom builds: Use in custom electric scooter or bicycle projects where a nontoothed metal flywheel with a 4hole mounting pattern is required. Installation notes Confirm sprocket type (54/T8F, 55, 65, 80/25H, etc.) and verify the flywheel dimensions and hole pattern match your vehicle before installation. Use appropriate fasteners sized for the 6 mm hole diameter and tighten to the vehicle manufacturer's recommended torque. Inspect mating parts (sprocket, bearings, shaft) for wear before fitting the flywheel to ensure performance. Performance expectations Provides stable, reliable operation when matched to the correct sprocket type and properly installed. Intended for deceleration/pulleystyle applications; not a toothed gear.