Shop › Schwalbe 24 inch wheel Presta valve bike inner tube Image 1 of 1 Schwalbe 24 inch wheel Presta valve bike inner tube £6.00 24x0.75 to 24x1. These tubes are for junior road bikes with narrow 24 inch tyres. 40mm valve. Purchase Added! 24x0.75 to 24x1. These tubes are for junior road bikes with narrow 24 inch tyres. 40mm valve. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More