For Yamaha electric assist bicycles This is a **speed sensor (custom item)**. Genuine sensor: 24 magnets This product: 8 magnet version By reducing the number of magnets, the assist will last longer than the genuine product. ■Compatibility Yamaha electric assist bicycle (Front wheel speed sensor type) *If the sensor has the same shape, it can be installed. Please check the images. ■Condition Operation is fine. ⚠️ Caution ・This is a custom part ・Not street legal *Installation and use are at your own risk. ❌ No returns Immediate purchase OK. Please feel free to comment if you have any questions.