29"

Need a spare tube for your 29″ mountain bike? Sick of getting flats & ready to try thorn resistant? Shop our range of 29″ bicycle tubes online now.

A quick run down on how inner tube sizing works

Your inner tube is the ‘balloon’ inside your tyre which punctures!

To find the right size tube you need to consult the sidewall of your tyre.

Your tyre should have somewhere on it printed into the rubber itself (harder to see) or branded on the side, it’s size.

The size format may be something like 29 x 1.75″ or it may say 47-622. Sometimes it will have both, because this is Imperial & Metric measurements.

The big number in both of these examples represents the tyre circumference, and the smaller number represents the width of the tyre.

So you are looking for an inner tube that matches your tyre size.

However, you will notice that inner tubes have a range of sizes that they cover (most of the time).

This is because inner tubes are balloons, so an inner tube can suit a variety of sizes as it inflates inside the tyre.

For instance a 29 x 1.75″ tyre, can use an inner tube which is 29 x 1.5 – 2.125″. Because the inner tube will suit both a narrower 1.5″ tyre, as well as a 2.125″ tyre.