225/75R16 vs 235/75R15 Side-by-side tire size comparison with specs and compatibility
This tire swap is within the safe 3% diameter threshold. It should not cause issues with speedometer accuracy, ABS, or traction control systems.
Full Specifications Comparison
| Specification | 225/75R16 | 235/75R15 | Difference |
|---|---|---|---|
| Overall Diameter | 743.9 mm (29.3") | 733.5 mm (28.9") | -10.4 mm |
| Section Width | 225 mm (8.9") | 235 mm (9.3") | +10 mm |
| Sidewall Height | 168.8 mm | 176.3 mm | +7.5 mm |
| Circumference | 2337 mm | 2304.4 mm | -32.6 mm |
| Revolutions/Mile | 689 | 698 | +9 |
| Aspect Ratio | 75% | 75% | 0% |
| Rim Diameter | 16" | 15" | -1" |
Key Impact Summary
Speedometer Correction Table
When switching from 225/75R16 to 235/75R15, your speedometer will over-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 29.6 mph | -0.4 mph |
| 40 mph | 39.4 mph | -0.6 mph |
| 50 mph | 49.3 mph | -0.7 mph |
| 60 mph | 59.2 mph | -0.8 mph |
| 70 mph | 69 mph | -1 mph |
| 80 mph | 78.9 mph | -1.1 mph |
| 90 mph | 88.7 mph | -1.3 mph |
| 100 mph | 98.6 mph | -1.4 mph |
| 110 mph | 108.5 mph | -1.5 mph |
| 120 mph | 118.3 mph | -1.7 mph |
What This Swap Means
Wider tires (235/75R15): The 10mm wider contact patch provides better grip in dry conditions and improved cornering stability. However, wider tires increase rolling resistance slightly, which may affect fuel economy by 1-2%. They are also more susceptible to hydroplaning in wet conditions.
Taller sidewall: The 7.5mm increase in sidewall height provides a more comfortable ride by absorbing more road imperfections. Taller sidewalls also offer better protection against pothole damage to wheels. The trade-off is slightly less responsive steering feel.
Ground clearance: Decreases by 5.2mm, lowering the center of gravity slightly which can improve handling stability.