You measure all those In Person?


I suppose many people have their own definitions ... Heres an old one .

Horizontal line with a vertical line thru the BB axis behind the BB is 'setback' to seat tube center line. 'reach' is the forward portion to the head tube steering Axis.**

Combining them is the effective top tube. between CL of the seat and Head tubes.. horizontal

** you may include stem length , to Reach and measure to the spot on the saddle you sit on , for a Bike to Bike comparison, if you wish

to include your seat post choice and where you tightened the saddle rails on the head of the Post.



CAD for the frame build? ? set back is angle, degrees, of seat post + tube length..