The numbers 4. Finally, the numbers 4. This indicates the tyre’s width in inches. In this case, the tyre has a width of 4. This represents the tyre’s load index, indicating its maximum load capacity. A higher number indicates a higher load capacity. This denotes the tyre’s rim diameter in inches.
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. The 3% rule says that your new tire’s total outside diameter should not change by more than ±3% compared to your current tire. If the increase or decrease is bigger than 3%, you risk problems like: Tire rubbing the frame or fork.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.