Tires: bmw tires 535, tire size calculator, rim diameter

Question
Just bought '93- 535iBMW
Need either winters or new all seasons ( have 4wd truck for real bad weather)  probably all seas.
currently 225/60/15 on factory rims (std)
other sizes work?  diff size rim?  Am finding 225 60 15 not that common here in okanagan, B.C. canada
Recommendations?

Answer
There are other sizes that would work.  If you stick with your stock wheels, a P215/65R15 would be much more common.

However, if you change rim diameter, there are quite a few that would work.  Try this:

www.1010tires.com

Look for the tire size calculator.

These guys are in your neck of the woods and might make the job a bit easier.  

Hope this helps.