245/60R18 vs 265/60R18 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 | 245/60R18 | 265/60R18 | Difference |
|---|---|---|---|
| Overall Diameter | 751.2 mm (29.6") | 775.2 mm (30.5") | +24 mm |
| Section Width | 245 mm (9.6") | 265 mm (10.4") | +20 mm |
| Sidewall Height | 147 mm | 159 mm | +12 mm |
| Circumference | 2360 mm | 2435.4 mm | +75.4 mm |
| Revolutions/Mile | 682 | 661 | -21 |
| Aspect Ratio | 60% | 60% | 0% |
| Rim Diameter | 18" | 18" | 0" |
Key Impact Summary
Speedometer Correction Table
When switching from 245/60R18 to 265/60R18, 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 | 41.3 mph | +1.3 mph |
| 50 mph | 51.6 mph | +1.6 mph |
| 60 mph | 61.9 mph | +1.9 mph |
| 70 mph | 72.2 mph | +2.2 mph |
| 80 mph | 82.6 mph | +2.6 mph |
| 90 mph | 92.9 mph | +2.9 mph |
| 100 mph | 103.2 mph | +3.2 mph |
| 110 mph | 113.5 mph | +3.5 mph |
| 120 mph | 123.8 mph | +3.8 mph |
What This Swap Means
Wider tires (265/60R18): 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 12.0mm 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 12mm, providing slightly better approach angles for off-road driving and speed bump clearance.