Amazon.com : YunSCM 20" E-Bike Fat Tires Heavy Duty 20 x 4.0/102-406 and 20" Bike Tubes Scharder Valve and 2 Nylon Rim Strips Compatible with 20x4.0 Electric Bike/Mountain Bike Tires and Tubes(YW081) :
Amazon.com: Continental 4070381F 7 Ribs 38.10" Multi-V Belt : Automotive