What is the 7 7 rule for tires?
The 7 7 rule for tires provides a simple temperature guideline for timing your seasonal tire changes. Install winter tires when daily temperatures drop to 7°c (45°f) or below for seven consecutive days. Remove them in spring after seven straight days above 7°c. Fuel consumption – as all season tyres are not optimized for warm weather driving, they do not perform as efficiently on dry roads compared to summer tyres. Performance on icy roads – whilst all season tyres are better for driving on snow or ice than summer tyres, they do not perform as well as winter tyres.When you’re on bare or wet pavement, the right set of all-season tires is designed to keep you safely on the road. They even do okay in mild winter conditions. But when the weather worsens and roads are covered in ice and snow, having the right set of winter or snow tires can help you stay in control of your vehicle.Temperature range and performance All season tires are optimized for moderate temperatures, while all weather tires are designed to maintain flexibility and traction in a wider range of temperatures, including cold winter conditions.
What does 60R18 mean on a tire?
How to Read Tire Sizes. Apart from the brand and model of tires, the largest set of numbers point to the size. For example, a tire size of 235/60R18 would correlate to a width of 235 millimeters, a sidewall aspect ratio of 60 percent, and a wheel diameter of 18 inches. Plug the sizes into a tire size calculator and it will tell you. Probably won’t notice the difference in the speedometer, although it will be off a bit.