This is the most common question we get asked.
If you are not sure of what your wheel size is, use the handy options below to find out:
Easy 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, or they can tell you.
Option 2: Check tyre markings
Most bikes tell you the wheel size right there on the tyre.
If not, measuring the metal rim diameter of the bike wheel is the best way to determine the specific size of the wheel.
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.
The images below summarise where to find the ETRTO, 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
|Wheel Size||Rim Diameter / ETRTO|
|27" / 27.5" / 650C||584mm|
|26" / 650C||559mm|
|20" 451 (old style)||451mm|
Not sure? Contact us
Contact us and we can help you confirm your wheel size.