What does 225 45R18 mean on a tire?
R18 tires have a diameter of 25. In summary, a P255/45R18 103H tire would be a passenger tire with a width of 255 millimeters, a thickness or aspect ratio equal to 45% of the tire height which here is 114 millimeters. It is also a radially constructed tire with a diameter of 18 inches that can carry up to 1,929 pounds and can go up to 130 mph.
What is the 3% tire rule?
The 3% rule states that when replacing tires, the new tire’s diameter should not differ from the original by more than 3%. This guideline helps maintain proper vehicle performance, safety system functionality, and speedometer accuracy. The 3% rule says that your new tire’s total outside diameter should not change by more than ±3% compared to your current tire. If the increase or decrease is bigger than 3%, you risk problems like: Tire rubbing the frame or fork.
What is the 7 7 rule for tires?
So, when is the right time to swap? The rule of thumb is 7-for-7: wait until there are seven consistent days at 7 degrees Celsius. The reverse is also true for transitioning to winter. Ottawa’s CAA Members can avoid the tire swap lineups at on-site vendors and save money with our economical new Mobile Tire Change. 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.