A standard 26 inch tube with a presta valve, from CST. If you are topping up the spares box or fixing a flat on a 26 inch wheel, this is the plain replacement tube for the job.

CST tyres and tubes are made by Cheng Shin Rubber Ind. Co. Ltd., the largest manufacturer of bicycle tyres in the world, distributed in more than 150 countries. The company works to stringent international standards with a strong emphasis on quality, delivery and customer satisfaction.