I am a proud noob and here is proof.

[In The Ten Ring]

I am actually asking such a question! *But I'm so manly I can ask this and not be embarrassed.

I measured my spare wheel today and from outside edge to outside edge it was a bit over 16 inches. It was like 16.25 inches.

1). Is that how rims are measured?
2). Does that mean I have "16 inch wheels?"

My dog dish hub cap I bought here a few months ago fit and it measured 10 & 3/8 inches inside rim to inside rim.