Feature: 1. Iron Material: Flywheel is made of premium iron material, which is oil resistant and has a long service life with reliable and durable performance. 2. Durable Design: With its exquisite craftsmanship, the flywheel is durable and will not deform over time, maintaining its function and performance. 3. Easy to Install: The flywheel with adapter is easy to install, convenient for professional bike mechanics and DIY enthusiasts. 4. Enhanced Power Transmission: The 20mm flywheel adapter and 16T flywheel set is designed to provide stable and efficient power transmission to your modified electric tricycles, motorcycles, or go karts. 5. Precise Sizing: The flywheel set features a 16 tooth design, providing precise engagement with the engine for optimal performance. Its compact size allows for easy integration into your existing system. Specification: Item Type: Freewheel Adapter Kit Material: Iron. Package List: 1 x Freewheel Adapter1 x Freewheel