265/70R17 vs 285/70R17 Side-by-side tire size comparison with specs and compatibility
This tire swap is between 3-5% diameter difference. Check for fender clearance and be aware of speedometer error. May require recalibration.
Full Specifications Comparison
| Specification | 265/70R17 | 285/70R17 | Difference |
|---|---|---|---|
| Overall Diameter | 802.8 mm (31.6") | 830.8 mm (32.7") | +28 mm |
| Section Width | 265 mm (10.4") | 285 mm (11.2") | +20 mm |
| Sidewall Height | 185.5 mm | 199.5 mm | +14 mm |
| Circumference | 2522.1 mm | 2610 mm | +87.9 mm |
| Revolutions/Mile | 638 | 617 | -21 |
| Aspect Ratio | 70% | 70% | 0% |
| Rim Diameter | 17" | 17" | 0" |
Key Impact Summary
Speedometer Correction Table
When switching from 265/70R17 to 285/70R17, your speedometer will under-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 31 mph | +1 mph |
| 40 mph | 41.4 mph | +1.4 mph |
| 50 mph | 51.7 mph | +1.7 mph |
| 60 mph | 62.1 mph | +2.1 mph |
| 70 mph | 72.4 mph | +2.4 mph |
| 80 mph | 82.8 mph | +2.8 mph |
| 90 mph | 93.1 mph | +3.1 mph |
| 100 mph | 103.5 mph | +3.5 mph |
| 110 mph | 113.8 mph | +3.8 mph |
| 120 mph | 124.2 mph | +4.2 mph |
What This Swap Means
Wider tires (285/70R17): The 20mm 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 14.0mm 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: Increases by 14mm, providing slightly better approach angles for off-road driving and speed bump clearance.