For a tire labeled 120/60ZR17, the R stands for radial construction. Meanwhile, in a tire labeled 180/65 B1, the B indicates bias-ply construction.

The M stands for a tire that meant to be used on a motorcycle, the following letter is the width code, and the number (such as 90 in this case) still stands for the aspect ratio. In this example, 17 ...

Good News: Motorcycle Tires Are Getting a Bit Less Weird. Unconventional rim and tire sizes are more common on older models, particularly if you go back to the 50s, 60s, and 70s. In the years since, ...

"Whatever size is intended for the bike is the size which should be fit again, for many reasons. Certain-size tires fit on certain-size rims, so you need to replace the correct-size tire onto the ...