What is the 3% rule for tires?
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. As a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of the tires originally on your vehicle.
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. Because measurement of sidewall height of the tire is a percentage of the tread section width a 75 tire would be taller than a 70 height aspect ratio tire if the section width was the same.
What is the 7 7 rule for tires?
If you leave them on too late, 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. 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.
What does LT mean on a tire?
Lt tires explained LT-metric (Light Truck) tires are specifically engineered to work with trucks, full size SUVs and Vans. Including also 1/2 ton, 3/4 ton and 1 ton load capacity. An LT tire is basically a reinforced tire with extra steel belt, thicker, stiffer sidewalls and a deeper tread. If you drive your truck heavily loaded or pull heavy trailer loads frequently, you should consider replacing your P-metric tire with an LT tire.