| Hi, this is the first time I post on this forum.
I've had my 98 M3 for a few years, but really don't know much about this car, and cars in general. I'm moving to MI soon so I'm looking for some all season tires.
Now the OEM sizes are 225/45-17 and 245/40-17. Do I have to follow the OEM size for choosing tire?
My reasons are 1) difficult to keep two set of tires 2) I'm thinking of getting some ContiExtremeContact, but they only have 245/45-17.
What would happen if I put 245/25-17 tires on the rear rims of my car? How about front?
Thank you for all your help. | 
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