What is the 3% tire rule?
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. It’s a guideline saying that swapping tire sizes different from the factory original means keeping the new diameter between three percent above or below the first one. Shifting too far risks speedometer error, ABS instability, and drivetrain issues.
What is the 7 7 rule for tires?
The 7-7 rule eliminates this terrifying gamble: switch to winter tires after seven consecutive days at or below 45°f (7°c), then switch back after seven days above that threshold. More specifically, if the average temperature is 7 degrees c or higher, you should swap to all-season tires, and when it drops below 7 degrees c, it’s time for winter tires.Many all-season tires do great in the rain and bare pavement year-round. While a set of all-season tires can offer some traction in light snow and the occasional winter storm, they’re not designed for deep snow, ice, and cold weather (when temperatures stay below ~45º F).