Do I need an ADAS calibration after replacing tires with a different size?
Short answer: Possibly. A change in overall tire diameter can affect ride height, wheel speed and sensor aim, so check the maker's requirements whenever tire size changes from the original equipment size.
Replacing tires with the same size and type usually does not call for a camera or radar calibration, though tire pressures should still be set to the placard and the TPMS system checked. The picture changes when overall diameter changes, such as larger off-road tires or a plus-size wheel package.
A taller or shorter tire changes ride height, which tilts a forward camera or radar up or down slightly. It also changes the wheel speed signal that ADAS modules use to estimate vehicle speed and distance. Some makers state that any change from the original tire size requires recalibration, and some do not allow certain sizes at all.
Before quoting a tire size change, look up the maker's position on modified tire sizes and whether a speedometer or tire size setting must be coded in a module. Document what you found for the customer. Do not assume the systems will adapt on their own, since driver assistance features may misjudge distances.
Tools used for this job
General guidance only. Follow the vehicle and tool manufacturer's procedures, and confirm vehicle coverage on the tool maker's list before buying.