IMPA 710725 Seamless carbon steel precision tube DIN 2445-2 20x2,5
Continental Inner Tube 20x2 – MATE Bike UK
Amazon.com : Pair of Two Vee Tire 20 inch Bike Tire Bicycle Inner Tubes 48mm Presta Valve, Fits 20x1.90, 20x2.0, 20x2.10, 20x2.125, 20x2.25, 20x2.35 and 20x2.50 Bike tire Sizes : Sports & Outdoors
Amazon.com : 2-Pack 20" Fat Tire Tubes 20 x 2.5/3.0 AV33mm Schrader Valve Heavy Duty 20" Bicycle Tubes Compatible with 20 x 2.5 20 x 2.6 20 x 2.7 20 x 2.8 20x3.0 Bike Tire Tubes : Sports & Outdoors