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Questions about selecting new rims/wheels on a classic American car…?

Okay, so a ‘73 Chevy Caprice is not really considered a classic but just a really old car, but hopefully I can still get some feedback to help this project along.

My main question is, how do I determine what size wheels to get for this car that’s slowly being restored and given some mild/street-legal upgrades?

I know the diameter that I want (15″) but I’m still not sure about the width the wheels, and what factors I should consider in selecting these.

So my questions are:

1) What’s the WIDTH of the wheels on the typical muscle car?

2) If I want wider tires in the back, do I necessarily have to get different size rims/wheels for the front and back of the car?

3) What kind of modifications may be necessary to fit new wheels?

Any feedback will help. Thank you.

I have restored many muscle cars and upgraded many. You have to check the clearance of the weel wells and measure them. You can still place larger tires on the same size rims slightly. You may have to purchase spacers that go between the drums on the rear and the rim (second choice). My first choice has always been to buy negative off set rims instead of spacers – they are safer.