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As regards bicycles: when we speak of "size of the wheel" the approach used is not completely correct.
The size in inches 20" 24" 28" et.  is an approximate measure of the final diameter of the wheel.
For this reason, "chubby" tires, being wider and taller, increase the final diameter of the entire wheel leading to commercial definitions which are not always very clear.
I.e. the 28x2.35 or wider, is commercially called 29" but the rim is a  28".
On the contrary, the tire for Trial is called 20x2.5 because the final diameter is always around 20". However, in order to be strong enough, the 20x2.5 tire needs a smaller rim, which in slang is called 19".
The tires are measured also in "mm". This defines both the diameter of the rim and of the tire. The dimensions in "mm" are:


Below an overview on the wheel sizes

203mm 305mm 355mm 387mm 406mm 507mm 559mm 571mm 584mm 622mm 686mm 787mm
12,5" 16" 18" 19" 20" 24" 26" 26" 27.5" 28-29" 32" 36"

trial with tire20x2.5

      MTB  Race 650B     700C    


But before going through the various types of tire we offer, let's look at the few steps to replace your tire correctly:

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