Tubes come in all shapes and sizes and we have them all. Not sure which tube you need? First check for any printing on the side of the tube to indicate the size of the wheel and diameter of the tube. Common road tubes are 700c with presta valves. MTB tubes are commonly found in 27.5", 29", or 650b with today's riders choosing presta valves over schrader. Presta valves can be identified by their shape and material, they are the skinny metal valves. Schrader valves are similiar to what you would see on your vehicles tires. Be certain you know your valve stem length as well, you'll need enough clearance to properly secure your pump to the valve.