Inner tubes have a big effect on the performance of your bike. Lightweight inner tubes will reduce rolling resistance and help you to ride faster, slightly heavier tubes will have better puncture protection and the wrong tubes..? They just won't work.
In this guide, Daniel Lloyd from GCN takes you through the differences between schrader and presta valves, how to work out which tube size your bike requires, and how to decide on the material.
Do you run standard tires with inner tubes or have you made the jump to tubeless?