What does 180 55 zr17 mean?
ZR 17 then: M/C (73W) Here is what these codes mean: 180 : The width of the tyre, expressed in millimetres. The aspect ratio (the sidewall height as a proportion of the tyre width). ZR : The R stands for Radial construction. The “Z” indicates the speed rating of the tyre, which in this case means it is rated above 240kph/149mph. The “R” denotes that the tyre is of radial type construction. The “17″ denotes that the tyre is 17 inches in diameter whilst “M/C” means the tyre is for a motorcycle.A: zr basically means the tire is adapted for speeds above 149mph. zr tires includes the speed ratings v(149mph), w(168mph) and y(186mph). The r stands for radial.For example, that means a common front tyre in 120/70 ZR17 size works out as… Width = 120mm Height = 70% of the width (84mm) Speed rating = ZR (240kph+), Diameter = 17 inches.The letters ZR on the sidewall relate to a tyre’s speed rating, which in this case is 150mph. That means it should not be driven at speeds in excess of 150mph (240kmph) – of course, where such speeds are even legal! Before 1990, ZR was used for high-performance tyres.
Can you mix R and Zr tyres?
It is generally not recommended to mix tyres with different speed ratings on your vehicle. It can lead to uneven performance, especially at higher speeds. ZR shown on the sidewall of your tire is a reference to the tire’s speed rating. Historically, the speed rating ZR on a tire meant that the construction of the tire could reach of 150 miles or 240 kilometers per hour. Today, a tire labeled ZR, has more capabilities than before.Z-rated high-performance tyres are rated for speeds in excess of 149mph. Confusingly, W-rated tyres are rated at a higher speed in excess of 168mph. Y-rated tyres are rated in excess of 186mph. See the full list below.
What does zr17 mean on a tire?
A: ZR basically means the tire is adapted for speeds above 149mph. ZR tires includes the speed ratings V(149mph), W(168mph) and Y(186mph). The R stands for radial. Priority Tire ✅ Some manufacturers will insert a “Z” in the middle of the tire size description (right after the aspect ratio) when the tire is rated at “W” or “Y. And if a tire is rated in excess of 186 mph (300 kph), manufacturer’s usually will list a “Z” within the size description, per industry standards.