Question regarding tire sizing.

gizmo8 wrote: ↑ 225/55/18 tires are the recommended size for my SUV for winter but you think 215/45/18 would be able to work...A buddy sold his car and have these leftover.

Did you try a tire comparison calculator?

https://tiresize.com/comparison/
https://tire-calc.com/comparison/225-55 ... 15-45-r18/

Not recommended to since the diameter of the leftover tire differs by more than 3%.

Your speedometer will show 110 km/h but actual speed will be 101.6 km/h.

Thanks!