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. 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.
Can I use 225 tyres instead of 235?
Yes, you can replace a 235 tire with a 225 tire in some cases. The 225 tire is narrower, so it may slightly change handling and grip. Always check your vehicle’s manual to confirm proper fit and safety. Rim width should be between 75 to 90% of the tire section width, so for a 235 tire that would be a 7 to 8.