275/70R18 vs 285/75R16 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 | 275/70R18 | 285/75R16 | Difference |
|---|---|---|---|
| Overall Diameter | 842.2 mm (33.2") | 833.9 mm (32.8") | -8.3 mm |
| Section Width | 275 mm (10.8") | 285 mm (11.2") | +10 mm |
| Sidewall Height | 192.5 mm | 213.8 mm | +21.3 mm |
| Circumference | 2645.8 mm | 2619.8 mm | -26 mm |
| Revolutions/Mile | 608 | 614 | +6 |
| Aspect Ratio | 70% | 75% | +5% |
| Rim Diameter | 18" | 16" | -2" |
Key Impact Summary
Speedometer Correction Table
When switching from 275/70R18 to 285/75R16, your speedometer will over-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 29.7 mph | -0.3 mph |
| 40 mph | 39.6 mph | -0.4 mph |
| 50 mph | 49.5 mph | -0.5 mph |
| 60 mph | 59.4 mph | -0.6 mph |
| 70 mph | 69.3 mph | -0.7 mph |
| 80 mph | 79.2 mph | -0.8 mph |
| 90 mph | 89.1 mph | -0.9 mph |
| 100 mph | 99 mph | -1 mph |
| 110 mph | 108.9 mph | -1.1 mph |
| 120 mph | 118.8 mph | -1.2 mph |
What This Swap Means
Wider tires (285/75R16): 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 21.3mm 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 4.2mm, lowering the center of gravity slightly which can improve handling stability.