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Does anyone know the diameter of the small end of the bell (bell to bow area)?

Tenon diameter is 7.25 inches (can vary slightly);

I'll measure the bow circumference tonight if you haven't had another response by then.

Is the big end of the bow really that big or are you talking about the tenon where the bell attaches to the tuba?

Hat......

Outer circumference measured at the top side of the large bottom bow ferrule on my 2xJ is 18.5 inches.

......so 5.888732 etc. diameter?

Here's a calculator:

http://math.about.com/library/blcirclecalculator.htm" target="_blank