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. If you leave them on too long, your winter tires will degrade quickly. 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.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 mobile tire change.
What does 75 mean on a tire?
The 75 tells us the tire’s aspect ratio, or the ratio between its cross-section height to its width. Our example tire is 75% as tall, from the inside rim to the outside, as it is wide. Key Differences Width: A 235/75R15 tire is slightly wider, offering a bit more contact patch and potentially better stability. Overall Diameter: Both share the same aspect ratio and rim size, so the difference in height is minor. A 235/75R15 is just a touch taller, which might create a small speedometer variance.The 70 or 75 is the sidewall height as a percentage of the tread width in mm. So for the same width tyre 235mm the 75 would have a 5% bigger sidewall height. This would affect the ride height and circumference of the tyre.Diameter Comparison The 265/75R15 tire is 30. R15 tire is 28. Their difference is about 1.