Will bigger tires affect my speedometer?
Yes. Larger tires cover more ground per rotation, so your speedometer will read slower than your actual speed. The error percentage equals the diameter change percentage.
How do I recalibrate my speedometer?
Most vehicles can be recalibrated via a dealer programmer, aftermarket tuner, or speedometer calibration device. Some trucks have a built-in tire size setting in the dashboard.
Will my fuel economy change?
Larger tires typically decrease fuel economy slightly due to increased weight and rolling resistance. The taller effective gearing can partially offset this at highway speeds.
Do I need a lift kit for bigger tires?
Depends on the size increase. Generally, increases over 1-2 inches in diameter may require a lift or leveling kit to prevent rubbing at full steering lock or suspension compression.