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We stock the categories of tubes listed below. If you're unsure about what type of bicycle/wheel you have or the valve type please read further down this page.

Children's bikes, folding bikes and BMXs

10-24" Children's Bicycle Inner Tubes

20" BMX Inner Tubes
20/16" Folding Bicycle Inner Tubes
24" MTB/Children's Bicycle Inner Tubes

MTBs 24", 26", 27.5" 29", MTB & Commuter Bicycle Inner Tubes
Road, racing touring and CX bikes 700c Road Bicycle Inner Tubes
700c Touring & Commuter Bicycle Inner Tubes
700c Cyclo Cross Bicycle Inner Tubes

Wheelchair and Mobility Scooters
Prams and Pushchairs

Wheelbarrow, Sack Truck and Trailer Inner Tubes

Motorbike, Scooter and Quad Bike Inner Tubes

 If you're unsure it's best to use the numbers on the side of your tyre to find your tube

The numbers on the sidewall of you tyre are the best place to look for your tyre and tube size information. Most tyres will show both an ETRTO size and a Metric or Imperial size. See below images for examples of two of the most common tyre sizes.

Mountain Bike 54-559 ETRTO or 26" x 2.1"

Road Bike 23-622 ETRTO or 700 x 23c


Choose the Correct Valve Type.

You should also make sure to choose the correct valve type. Read more about bicycle valve types here.

What Do The Numbers Mean?

Imperial and Metric Sizing

26x2.1 and 700x23c in the example images above
These are the sizes most people recognise and how inner tubes are named on The first number is the diameter and the second is the width of the tyre. However, they do not exactly represent the actual size of your tyre so can lead to confusion in a few cases as outlined further down this page.

ETRTO Sizing

54-559 and 23-622 in the example images above
ETRTO sizing is a world-wide standard developed by the European Tyre and Rim Technical Organisation. This sizing method is much more accurate by exactly describing the tyre width and rim diameter in millimetres and ensures you are definitely getting the right size tyre or tube, but they aren't exactly catchy to remember!

MTB 26" diameter wheels with ETRTORoad 700c diameter wheels with ETRTO

MTB profile with ETRTO equivalentRoad profile with ETRTO equivalent


Which Sizing Method Should I Use?

You can use either size method but on the whole metric and imperial sizing works fine especially for inner tubes as they are much more adaptable to various sizes, unlike tyres which are rigid in diameter and therefore must be matched to the rim size accurately.

ETRTO sizing should be used for inner tubes and especially tyres if you have the following type of bike/wheel to avoid confusion:
  • Traditional Touring Bikes
  • Folding Bikes
  • Older 3 Speed Bicycles
  • 650b Mountain Bike
  • 650c Aero/TT/Small Road wheels
  • Wheelchair
  • Motobility Scooter

It's also worth noting that the exact rim diameter of 29" MTBs is the same as standard road and touring wheels at 622mm so tyres and tubes can be used on both platforms. Note; wide mtb tyres should not be used on slender road rims for stability reasons and MTB Tyres may not fit in the frame of a road bicycle.


A note about anti-puncture tape and tyres

Many people these days are using tyres with a puncture protecting tape, either built into the tyre like the Schwalbe Plus and Continental Gatorskin ranges, or fitted afterwards like our Dr Sludge Anti-Puncture Tape. These protective layers take up some of the space inside the tyre so you should take between two and four millimetres (or 0.1 - 0.2") off the stated width of the tyre when selecting which tube you need, depending on the thickness of the tape in your tyre.


If you would like to know more about tyre sizing:

The late Sheldon Brown amassed a huge amount of information about all things bicycle so to become a real expert visit Harris Cyclery's Tire Sizing Page where all his knowledge has been published.


What If You Don't List My Size?

Inner tubes by their nature expand and contract so sizing is more flexible than with tyres. Although we don't recommend it, if you cannot find an exact match in our sizes if the size you purchase is relatively close the tube will often fit anyway. Please remember that if choosing a tyre the rim diameter must be an exact fit.

We welcome requests for range expansion so please let us know which new inner tubes sizes or other products you would like to see by using our contact form.


We Love Inner Tubes!

We have a huge range for bikes, prams, wheelbarrows, scooters and much more. We offer you great prices, great service and FREE UK Delivery. Plus our own brand tubes have a no-return-required guarantee!