thinking of taking the 18s from 2026 Cx30 and putting them on 2022 CX5 and putting the 17 inch CX5 wheels on the Cx30. any tpms differences or shld they swap without issues?

 

Does your model have a single Tire PSI reset button?
If so, then you have no TPMS in the wheels and can change them. Your speedometer may be off by 1-3 mph.

 

Yes they are interchangeable. TPMS are the same. Offset is the same (+45mm). Tires will need to be changed to meet the OEM wheel diameter though.

 

Maybe without having the VIN info he would be better to consider contacting Mazda service department have his VIN run and get the definitive answer.
As for the wheel diameter if one looks there are a couple tire and wheel option OEM You
Would. not necessarily need to match the same old tire for a 1 -2 mph reporting difference? Unless your brain could do the simple subtraction difference at a glance ?