So, going back to the original post, it appears absolutely necessary to have an accurate measurement of the lineal offset to use this formula. What I don't see is a practical way to arrive at this on a real bike, assembled, with fender,wheel and tire in place. How the hell do I do this?
the Red Menace
"You are measured by how you ride by people who ride, and how you pose by people who pose." Alejo
"Riders who get pissed off are doing it wrong." DAKEZ