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Message: <blockquote data-quote="AaRoN" data-source="post: 221807" data-attributes="member: 8691">Speed RatingIn Europe, where selected highways do not have speed limits and high speed driving is permitted, speed ratings were established to match the speed capability of tires with the top speed capability of the vehicles to which they are applied. Speed ratings are established in kilometers per hour and subsequently converted to miles per hour (which explains why speed ratings appear established at "unusual" mile per hour increments). Despite the tire manufacturer's ability to manufacturer tires capable of high speeds, none of them recommend the use of their products in excess of legal speed limits.17 inch tires: While a Z-speed rating still often appears in the tire size designation of tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph ; the W in the service description indicates the tire's 168 mph maximum speed.So basically the factory tires (17's) are rated at up to 168mph.16 inch tires: Mustangs with the 16's (yuk) were rated at up to 130mph.</blockquote>