Egghaus

Bit of a dumb question here, one of my rear tires has been damaged, and I threw on one of the 225/45R18 winter tires just to have the car on 4 wheels. Is it OK for the 4matic system to drive 20 minutes to the tire shop this way? I would think this diameter difference is no greater than using a compact spare or driving on a flat Runflat. Should I put the matching winter tire on the other side? Probably over thinking this, just never put a spare on a car with AWD and staggered tires.

C43HeartBoost

For such a short drive to the tire shop I do it see how it would be a problem.

GWSHARK

No different than using a typical donut spare. Should be fine.

jhpmbusa

just out of curiosity are the rest factory 18s or 19s etc?

Egghaus

Factory staggered 18" setup.

stockbmw

Difference between 225/45R18 and 245/40R18 is 1% diameter. Lower the %, safer for rear left and right to travel. But we don't have positraction to worry about one side spinning out.

jonathan358

Not an issue for short drive, although next time swap both rears as mentioned.