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Message: <blockquote data-quote="Schwepps" data-source="post: 462493" data-attributes="member: 3592">Hold your horses young man! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> The Z rating is actually an older rating before the W and Y ratings arrived. It means rated for speeds in excess of 240kmh. That was because back then very few road cars could go faster than 240kmh. Now, practically all premiums and exotics can exceed that easily, so the W and Y ratings came along to denote 270 and 300kmh maximum speeds.Z is now rather superfluous in tire markings. For eg, my new PS2s fronts are 225/40/ZR/18/88Y. The Z means they can exceed 240kmh. The R stands for radial, another superfluous marking. The Y means their max speed is 300kmh. If the 88Y was in parentheses (88Y) it would mean they have been tested above 300kmh and can exceed that speed. BTW, 88 is the max load rating, nothing to do with the speed rating.</blockquote>