Guide
What Tire Size Difference Is Acceptable?
The 3% rule that pros use when plus-sizing or downsizing tires.
Key takeaways
- Industry standard tolerance is ±3% in overall diameter.
- Above 3%, you risk inaccurate readings, transmission shift point changes, and traction control issues.
- TireFitCalc highlights this automatically with a color-coded verdict.
Main explanation
Industry standard tolerance is ±3% in overall diameter. Inside that range, your speedometer, ABS, and stability control will behave normally.
Above 3%, you risk inaccurate readings, transmission shift point changes, and traction control issues.
TireFitCalc highlights this automatically with a color-coded verdict.