In this photo we have a 180/55 ZR17 (73W) tyre, whichmeans it’s 180mm wide, and the profile height is 55% of that, so 99mm.

The design of a decent motorcycle tyre is all about itsconstruction, compound and tread pattern.

Simply put, a single layer of material on the inside of thetyre’s carcass.

Eventually tires wear out, and needreplaced. Typically the rear tires start to square up, losing their roundedprofile, as the center of the tread wears away faster than the shoulders.

The chronological age of any tire can be found on the tire sidewall by examining the characters following the symbol "DOT".