Bicycle wheel sizes don’t work the way you think. The name e.g. 26″ refers to the outer tyre diameter. And there are actually many different wheel sizes all called 26″, because there are lots of different tyre thicknesses. E.g. with a thin tyre, the wheel rim diameter is much larger than with a fat tyre. You need to check exactly which wheel size you have before you buy against our table of wheel sizes.
Want to know more? Continue reading for further information.