Ok, i'm going to meet my stupid question with yet another stupid question.

The rain stopped, so i got down and measured. Then i realized that the reason that i have been eyeballing less than the necessary space needed is because... i probably have 6.5 inch wheels and not 6 inch wheels!!
I had been under the impression that all Bundt 14's were 6 inches. But, some are 6.5.

So here's my stupid question... What is the best way to measure the rim size while it has an inflated tire on it?

I have ordered the wheels and tires. If my wheel is in fact 6.5 inches, then based on my real life measurements i'm all set.

But if my current wheel is actually 6 inches somehow, then i am 50% certain I will need to order spacers.

I can hold up a ruler/measuring tape and eyeball the width of the wheel but it's a bit inaccurate seeming to do it this way. Is there a size/model indication somewhere on the rim?

I apologize if this is just plain annoying !!