What is the 3 tire rule?
The 3% tire rule means your replacement tire should be no more than 3% taller or shorter than your original tire. Why experts recommend replacing tyres at 3mm. Although 1.
What is the 105% rule on tires?
The rule of 105 says your rim’s external width must be at least 105% of your tire’s actual measured width. If the rim is narrower than the tire, airflow breaks apart and creates drag. If the rim is slightly wider, air stays attached and improves speed and stability. It’s highly recommended to use the exact tire size recommended for your car. However, in a pinch the tire width and aspect ratio can be changed slightly and still fit on your rim. Although this will still work, keep in mind it may have adverse effects on the performance of your car.The 10mm jump from 255 to 265 typically works fine if your rim can handle the wider footprint. However, stretching too wide a tire onto a narrow rim affects handling characteristics and can lead to tire failure at highway speeds. Your wheel’s specifications matter more than the tire numbers alone.
Should all four tyres on a car be the same?
For optimal safety and performance, we recommend fitting the same tyres to every wheel position on your car, so you should have the same brand, size, tread pattern, load index and speed rating on the front and rear tyres. It is important to check your vehicle handbook and ensure that any new tyres match, or even exceed, your car’s maximum speed. You should never fit a tyre with a lower speed rating than was originally fitted to your vehicle during production.