TRP Centerlock Rotor Magnet for E-Bike Speed Sensor SP-SS20 - Two Hoosiers Cyclery, LLC
E-Bike 12 M PAS P A S Tz S E Easy Fg- €2.10 hittech.com
Yamaha Speed Sensor Wheel Magnet
Amazon.co.jp: Electric Bike Power Pedal Assist Sensor, Bicycle Pedal 12 Magnet E-Bike PAS System Assistant Sensor, Mountain Bike Sensor Speed Sensor Magnet Sensor : Sports & Outdoors