I finally got a Wixey digital angle gauge and measured the head tube on my Mach 5. I have a RS Revelation fork with an A2C of 529.
Pivot bikes come with a 140 mm Fox fork, which has an A2C of 521, so I cranked my Revelation down to approx. 132 mm to get a comparable measurement.
I had been using my iPhone with the clinometer app, but figured that it was probably not that accurrate. Believe it or not, my new Wixey digital gauge comes up within 1 degree of my iPhone:
I measured it on the fork stanchion. I also put it on the badge on the head tube and came up with basically the same.
All of the literature that I see says that the head angle is 69.0. 1.5 degrees is a pretty big difference.
Any ideas why I am getting such a different measurement?
Results 1 to 4 of 4