How do I tell the difference between steel and alloy rims?

[TahoeJim]

Bought my jeep used with these Pro Comp rims, and am looking to buy another set to swap winter and summer tires. Would like the exact match as I have a spare with the same rim/tire combo I'm getting.
How do I know if these are the Series 97 steel wheels or the Series 69 alloy wheels?
97 and 69 look the same online. There's no markings on mine that I can see. ??

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[mrjp]

Try using a magnet If steel it should stick alloy it should not stick

 

[MudGruff]

A magnet is a good starting place. Works for jewelry too.

 

[BLACKJKU]

Also by the thickness of the material, steel will be thinner and other alloys will be thicker in order to be the same strength as steel.

 

[TahoeJim]

well, I should have thought of a magnet. thank you will give that a go when i'm up again.

 

[terdogjk]

Judging by the pic, seeing how thick the material is at the holes I'd bet that they are alloy.