Plus / Minus Sizing
Find a matching size for a new wheel diameter
Current Size
Tire size
Target Wheel Size
Target rim diameter
Recommended Sizes (closest to original diameter)
| Tire size | Diameter | Difference | Speed Error | Suitability | |
|---|---|---|---|---|---|
| 235/45 R18 | 668.7 mm | +0.06% | +0.06% |
Best
|
|
| 265/40 R18 | 669.2 mm | +0.13% | +0.13% |
Best
|
|
| 175/60 R18 | 667.2 mm | -0.16% | -0.16% |
Best
|
|
| 305/35 R18 | 670.7 mm | +0.36% | +0.36% |
Best
|
|
| 195/55 R18 | 671.7 mm | +0.51% | +0.51% |
Good
|
Note
- Diameter difference should not exceed ±3% to keep the speedometer and other measurements accurate.
- A change in tire width may affect grip, fuel economy, and wheel balance.
- Please check compatibility with your wheels and vehicle before installing.
All Tools
Tire Size Calculator
Calculate and compare tire sizes
Plus / Minus Sizing
Find a matching size for a new wheel diameter
Wheel Fitment
Calculate offset and wheel position
Unit & Tire Converter
Convert units and tire sizes
Comparison & Reports
Compare multiple sizes and generate a report
Speedometer Error
Calculate speed reading deviation