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i have the stock wheels on my 1980 civic wagon i think they are 12 in or maybe 13 inches.they are getting hard to find what other size wheels and tires will fit?

 
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I believe the bolt pattern is 4x100 and they are 13" wheels currently on it. The things to watch for when switching rims/wheels are:

Back spacing ( the distance between the back of the rim where it mounts to the hub & the edge of the rim leaving roughly 1/2 to 3/4"
extra for tire bulge)
Circumference of the new rim w/tire installed. If the profile is the same height you are good. Ex: 195/75r13 to 195/65r14 roughly the same
diameter.
And of course the bolt pattern. ( As I stated in the beginning if I remember should be 4 x 100.)

If the car is lowered you will also need to check for fender clearance as well, which involves wheel depth..........