[Quote; ....Hell, anyone know the ID of a 1 1/4 straight wall Titanium tube from the early 90s? Hell, even an idea of the common wall thicknesses? UNQUOTE]
IthaDan; It would depend on its ID and wall thickness....
[Quote: The best I can surmise with my questionably accurate calipers, the wall thickness is 1.05mm. Unquote]'
IthaDan; Suggest find something of known size and then use the calipers to measure it. Worse case you will then know how much they are off kilter. Then just do the math to get the size of something unknown. Of course a pretty decent digital calilper with spare battery and a nice foamed snap plastic case is about $16 or so on Amazon.
Hope that helps
/K