Originally Posted by
Andy_K
That was an initial indent made based on a tire that ended up being a bit shy of 38. The 650x42 tires needed a much bigger dimple.
More info, the Atelier has two big ol' C-clamps with brazed on indenters. One is horizontal, the other, vertical. My test tire
said it was 42mm wide, but it was a lying S.O.B., and Andy's
real 42mm wide tires. I initial indent was perpendicular to the stay, which of course wasn't quite enough, so we switched to the other tool, which made all the difference