What's the best way to measure for tire size.

I've mentioned this in earlier posts, I made my own gadget based on the Percy's tool. It wasn't too hard to do, and the bottom line is it worked perfectly and when my wheels / tires showed up they fit exactly as I expected they would. Just made another one for my son last weekend, as he is looking for new wheels/tires for his Suzuki Sidekick hunting wagon project. Takes out ALL the guesswork.
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That's pretty cool!