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FITS YOUR 20 INCH KIDS' BIKE – Made for 20 inch tyres from 20 x 1.75 to 2.40, for example 20 x 1.75, 20 x 1.95, 20 x 2.00, 20 x 2.125 or 20 x 2.25. Ideal for children's bikes, junior bikes, BMX and folding bikes. TUBE QUALITY THAT HOLDS AIR – Every AirFusion tube is checked for airtightness, valve seating, dimensional stability and finish before it ships. Heat-moulded butyl with an even wall thickness holds air reliably: less re-pumping in busy family life, a precise fit inside the tyre and long-lasting durability. SCHRADER VALVE FOR QUICK TOP-UPS – The robust AV valve (Schrader) fits floor pumps, mini pumps, compressors and any petrol station air line. Simply attach the pump head and go, no unscrewing needed – the wide, sturdy valve body gives you a secure hold while inflating. COMPLETE 2-PACK INNER TUBE SET – 2 bike inner tubes 20" AV 40 mm with 2 valve caps, 2 valve nuts for a stable valve seat and easy-to-follow fitting instructions. Ideal for both wheels, or keep the second tube as a spare for the next puncture – quickly swapped and ready to ride again. 1-YEAR MOBILITY GUARANTEE – Tube failed? If a tube is defective, you get a free replacement, dispatched by Alphatrail Support within 24 hours of your report – so the kids' bike is rolling again quickly. Over 600,000 AirFusion tubes sold, 98% customer satisfaction, recommended by Daniel von Kossak and more than 1.1 million customers trust Alphatrail.