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. 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.
What is a 305 tire in inches?
The first number in the tire size, 305, represents the width of the tire in millimeters. To convert this to inches, we divide 305 by 25. This gives us approximately 12 inches. This number represents the tire’s overall height in inches. In this case, the tire is 33 inches (838. The second number is the tire’s width in inches. This means that the tire is 12.The conversion to metric for 33/12. R15. The Key number is the 318 that is the width in mm. Also the calculation for the diameter of your tires are 33.The numbers 275 or 285 refer to the width of the tire in millimeters. So, a 275 tire is 275mm wide, and a 285 tire is 285mm wide. That 10mm difference affects grip, handling, fuel consumption, and the amount of space the tire occupies under your fender. It also alters the footprint’s shape that lies on the road.A 33×12. R20 tire measures exactly 33 inches in diameter, 12. The metric equivalent is approximately 318/60R20, with 305/55R20 being the closest available alternative size.