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. While it’s possible to fit a different size tire on your original rims, it’s a game of inches where a mistake can be dangerous. A small change in width or sidewall height might be fine, but going too far can cause serious issues with rubbing, handling, and speedometer accuracy.
What is the 3% rule on tires?
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. Use this tire tread depth chart as an example: Brand new – 12/32” 25 percent worn – 9. REPLACE TIRES.
What is the 7 7 rule for tires?
The 7°C rule is straightforward: monitor the temperature, and if it hovers around 7°C and below for seven consecutive days, it’s your cue to switch your existing tires to a good pair of winter 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.