The MH90-21 and 90/90-21 are tire sizes used on motorcycles. The MH90-21 is the same as an 80/90-21, which means it is 10mm narrower than the 90/90-21.
The sidewall of the MH90-21 is slightly shorter than the 90/90-21, with a height of 90% of 80mm, compared to 90% of 90mm for the 90/90-21.
The 90/90-21 tire is larger in diameter than the 80/90-21 tire, with a difference of 0.71 inches (18mm) [5]. The speedometer difference between the two tire sizes is 2.6%.
It is important to note that motorcycle cruiser tire sizes can vary between manufacturers, and it is recommended to consult the manufacturer’s specifications for the specific tire being considered.
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