Rims are one issue, I won't comment on that.

Tires.

1) For any car, same type (brand & model) and size of tire on the same axle

2) Balance of wear (used on one wheel and new on the other) is a safety, handling and (potentially) alignment issue. Take the good tire from that axle and use as your spare tire. Then put a pair of new tires on that axle (rim with bad tire and your current spare tire rim). Remember, tires age - so having a less old spare tire might save you some day

3) When you but ONLY a pair of new tires, ALWAYS put them on the rear axle - regardless of RWD, FWD or 4WD. Some people believe it's up front, which is 100% wrong and VERY unsafe.

There is an excellent skid pan video on the Michelin USA web site to show you WHY.

4) For a 4WD vehicle, European (and good practice) safety and TUV requires the same type (brand and model) tire on the front & rear of the car.


Best regards