255/40R19 vs 265/35R19 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 | 255/40R19 | 265/35R19 | Difference |
|---|---|---|---|
| Overall Diameter | 686.6 mm (27") | 668.1 mm (26.3") | -18.5 mm |
| Section Width | 255 mm (10") | 265 mm (10.4") | +10 mm |
| Sidewall Height | 102 mm | 92.8 mm | -9.2 mm |
| Circumference | 2157 mm | 2098.9 mm | -58.1 mm |
| Revolutions/Mile | 746 | 767 | +21 |
| Aspect Ratio | 40% | 35% | -5% |
| Rim Diameter | 19" | 19" | 0" |
Key Impact Summary
Speedometer Correction Table
When switching from 255/40R19 to 265/35R19, your speedometer will over-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 29.2 mph | -0.8 mph |
| 40 mph | 38.9 mph | -1.1 mph |
| 50 mph | 48.7 mph | -1.3 mph |
| 60 mph | 58.4 mph | -1.6 mph |
| 70 mph | 68.1 mph | -1.9 mph |
| 80 mph | 77.8 mph | -2.2 mph |
| 90 mph | 87.6 mph | -2.4 mph |
| 100 mph | 97.3 mph | -2.7 mph |
| 110 mph | 107 mph | -3 mph |
| 120 mph | 116.8 mph | -3.2 mph |
What This Swap Means
Wider tires (265/35R19): 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.
Shorter sidewall: The 9.2mm decrease in sidewall height improves steering response and cornering precision. However, ride quality becomes firmer and the wheels are more vulnerable to pothole damage. This is a common trade-off when upsizing wheels (plus-sizing).
Ground clearance: Decreases by 9.2mm, lowering the center of gravity slightly which can improve handling stability.