Amazon.com : 6-Pack 700C Road Bike Tubes 700 x 18C/20C/23C/25C AV48 Long Valve 700C Bicycle Tubes Plus 2 Rim Strips Compatible with 700 x 18C 700 x 20C 700 x 21C 700
Amazon.com : MICHELIN A1 Airstop Front or Rear Road Bike Tire Tube, Presta Valve,18/25 x 622, 52mm : Bike Tubes : Sports & Outdoors