What is my wheel size?

This is the most common question we get asked. 

Firstly - don't worry too much about the wheel size before ordering. We offer the kit in ANY size for ANY bike, and we can help you check your wheel size after you order. Once your order is in our system we'll invite you to our order portal to confirm your specifications - such as wheel size. We even have a free video call service to help you out if you need assistance with confirming these details.

Note: Most adult bicycles (apart from folding bikes) have a standard 700c / 28" wheel.

In the meantime, if you want to work out for yourself what your wheel size is, use the handy options below to find out:

Option 1: Ask the bike seller

If you bought the bike online or from a shop, then check with the seller. The wheel size is probably listed in the specifications manual that came with the bike, online or they can tell you.

Option 2: Check tyre markings

Most bikes have the wheel size marked on the tyre. 

The images below summarise where to find the ETRTO, French version and English version tyre markings, and what wheel sizes they correspond to in the table below.


Option 3: Measure yourself

A final option is to take off the bicycle wheel tyre, and measure the diameter of the rim, which is also called the ETRTO

Note, the diameter of the bicycle rim is NOT the same as what the wheel is called. E.g. if you have a 26″ bike wheel, the measurement 26″ relates to the outer diameter of the tyre, not the rim.

A quick lookup of bicycle wheel size name and rim diameter/ /ETRTO is below:
Wheel Size Rim Diameter / ETRTO
28" 29er 700C
27" / 27.5" / 650C 584mm
26" / 650C 559mm
24" 507mm
20" 451 (old style) 451mm
20" 406 406mm
16" 349mm


Not sure? Contact us.

Contact us and we can help you confirm your wheel size.

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