I doubt that is as simple as it appears. Likely an expensive "recalibrator tool" and may be illegal in some states/countries.Here is some interesting information related to the speedometer following a tire size change.
Would appreciate your comments as to its applicability for the Kia Niro.
1. Be sure to reprogram your OBDII system when changing tire size.
How to Reprogram a Computer When Changing Tire Size
2. If your car has a digital speedometer, it can be recalibrated for a different tire size.
Have you changed your tire size or final-drive gear? You just made your speedo and odometer inaccurate. Here's how to fix them both.www.roadandtrack.comI just got new tires on my 2011 Kia Sportage EX, the OEM tire size is 235/55/18. The size I just got is 235/60/18 and the speedometer is now off buy about 5 MPH is there a way to recalibrate the speedometer?www.kia-forums.comHypertech is a SEMA member company dedicated to supporting the aftermarket distribution system, with innovative products that exceed consumer expectations in performance and quality. Creating consumer demand with emissions legal products for street and off-road that can be sold worldwide...www.hypertech.com
For a very slight tire size difference, I would not worry about it, but in following this thread theme, the change would be excessive - like 15% plus...