27"

Need a new tube for your vintage road bike? Check out our range of 27″ bicycle tubes for road bikes & retro bikes. We ship Australia wide.

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 27 x 1 3/8″ or it may say 37-630. 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.

Our hot tip for choosing an inner tube when you have options of ranges is to choose the one which is on the smaller size.

This is to make fitting the tube inside the tyre easier. While they will both fit your tyre, and will both work just fine, one is a better fit. And therefore a little easier to feed into your tyre.

And anything which makes fitting a tube in a tyre easier is a good thing!

If you’re still unsure about what size tube you need we can absolutely help! Give us a call or send us photos of your tyre if you are lost and we can figure it out for you.