pic: Seattle Cascade tubes.

[Jared Russell]

Originally Posted by GaryVoshol

The device was not spelled out, but the spec was:
As I recall, the triangles use the 7" guage, and the square and circle use the 8" guage. The way the triangle is made causes it to bulge up at the corners. The square does so as well, but not as much.

These tubes are easily 20% larger than the tubes in Florida (but still smaller than the tubes I saw in NJ).

I have it on good authority (from just asking refs and FTAs) that the field manual is pretty sparse on details as to HOW to use the gauge (blow up UNTIL the tube fits vs. blow up and FORCE the tube to fit vs. blow it up all the way and hey, it still fits!).

With a compliant object like an inflated inner tube, I have no doubt that a triangle on the verge of bursting could still fit into a 7" gauge...