Originally Posted by
squadcar
To answer that question or at least take a better guess, I need t know the height of the frame. At Proteus we used mostly Reynolds, some Columbus and occasionally some straight 4130.
It's a 60 x 58.
Whichever tubes were used, they're right. Reasonably light, comfy, rigid and perfectly stable on high speed downhills. Not all frames my size can do that.
Update. The steerer tube says "Reynolds 531 Butted 16/13." The BB is 70mm Italian.