Changing the tire size works the same in all vehicles.
Attention
Make sure your engine is NOT RUNNING
- Connect to your vehicle
- Open Adaptation
- Open Tire & Axle settings.
Set Tire Size:
- Choose a value from the drop-down list. It represents a tire diameter in inches.
Note
If you pick a value that matches your tire size exaclty, your speedometer will be showing a higher reading than your GPS. That's normal - your factory wheels with factory settings worked the same. Blame the law-makers (At least in the EU). We recommend setting a value that is about 0.5 inch smaller than your actual tire size.
- If you enabled it in App & Adapter settings, you will have manual input availabe. This however is wheel circumference in mm. Not recommended.
- With manual input enabled you migth get an error when trying to set a value from a drop-down. In that case, disable manual input.
- Disconnect, close the car, let it sit for a few minutes. No ECU reset required.
Some vehicles (especially the more "civilian" ones) have a max tire size value they can handle. You can set a higher one, but the ABS module will throw a warning on your dash. Decrease the tire size.
If you have any errors after setting the tire size (including because of the issue above):
- Connect to your vehicle
- Run Advanced Scan
- Clear the codes
- Fix the tire size setting
- Restart the vehicle and see if the problem is fixed
- If not, go to Adaptations, use search to find "ABS Static Init" (preferred) or other ABS Initialization procedure and run it.
- Clear the error codes again
- Restart your vehicle
If the steps above didn't solve the problem, then most likely your vehicle is not designed to accept any other value than factory. Go to JScan settings > Trace & Restore Adaptations to either check the history of changes or revert all settings to factory.