245/70R17 vs 265/65R17 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 | 245/70R17 | 265/65R17 | Difference |
|---|---|---|---|
| Overall Diameter | 774.8 mm (30.5") | 776.3 mm (30.6") | +1.5 mm |
| Section Width | 245 mm (9.6") | 265 mm (10.4") | +20 mm |
| Sidewall Height | 171.5 mm | 172.3 mm | +0.8 mm |
| Circumference | 2434.1 mm | 2438.8 mm | +4.7 mm |
| Revolutions/Mile | 661 | 660 | -1 |
| Aspect Ratio | 70% | 65% | -5% |
| Rim Diameter | 17" | 17" | 0" |
Key Impact Summary
Speedometer Correction Table
When switching from 245/70R17 to 265/65R17, your speedometer will under-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 30.1 mph | +0.1 mph |
| 40 mph | 40.1 mph | +0.1 mph |
| 50 mph | 50.1 mph | +0.1 mph |
| 60 mph | 60.1 mph | +0.1 mph |
| 70 mph | 70.1 mph | +0.1 mph |
| 80 mph | 80.2 mph | +0.2 mph |
| 90 mph | 90.2 mph | +0.2 mph |
| 100 mph | 100.2 mph | +0.2 mph |
| 110 mph | 110.2 mph | +0.2 mph |
| 120 mph | 120.2 mph | +0.2 mph |
What This Swap Means
Wider tires (265/65R17): 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 0.8mm 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 0.8mm, providing slightly better approach angles for off-road driving and speed bump clearance.