[BadTwin]

Would be what?

If you took a tape measure and wrapped it around your head pipe what would a stock head pipe measure out to?

 

[Wizwill]

Would be what?

If you took a tape measure and wrapped it around your head pipe what would a stock head pipe measure out to?

That would give you the circumference. Divide that by 3.1416 and you would have diameter.

 

[MegaGlide]

Easy as Pi....

 

[BadTwin]

:wacko: :duh?: :thanks: