I went to a similar site and figured out that 225/70/16 is identical to the OEM 235/55/18. Fortunately, My speedometer shouldn't have any difference.
The new rim size can cause poke. What are the measurements for the rims. The oem tyre size looks much better and will respond better to steering. 225/70/16 tyres are on the lowest grade of Sportage. Big side wall