Continental, Inner tube, Presta, 42mm, 29 x 1.75-2.5 (bulk no packaging) single - GearHub Sports
2-Pack 26" Bike Tubes 26x1.75/1.95/2.125 TR4A-40L Valve 26" Bicycle Tubes Compatible with 26 x 1.75 26 x 1.90 26 x 1.95 26 x 2.0 26 x 2.10 26 x 2.125 Mountain Bike Tire Tubes : Amazon.ca: Sports & Outdoors
NEW BULK Continental RACE 28 700c x 18-25 60mm Stem Presta Valve Bike Inner Tube | eBay
2-Pack 16" Bike Tubes 16x2.125/2.2/2.35/2.40" AV32mm Valve Heavy Duty 16" Bicycle Tubes Compatible with 16 x 2.125 16 x 2.2 16 x 2.25 16 x 2.30 16x2.35 16 x 2.40 Bike Tire Tubes, Tubes - Amazon Canada