So, what is the function of dropout adjusting screws? Even in the long dropouts, the springs take up so much room that there really isn't much room for adjustment. And what difference does the adjustment make? I doubt if anyone would notice the change in wheelbase. The whole long dropout/long adjusting screw has always baffled me. It always seemed like the long dropout was just a leftover from the Cambio Corsa or something like that.
Louis Schulman Tampa, Florida, where I was able to ride between storm clouds for a nice 50-mile tour around the Bay on my 1973 Ron Cooper (which has the long droupouts and adjusters, fwiw)
On Sun, 15 Jun 2003 15:52:55 -0700, Chuck Schmidt wrote:
#Boy, you have an eagle eye, Steven! My circa 1954 Bianchi Campione del #Mondo has the dropouts you describe above with the larger 4 mm screws.
#I never even noticed. # #The small spring anchor hole drilled above the threaded derailleur #hanger hole is for the Sport derailleur. As you know, the Sport has a #fixed single pulley cage so the top of the body is sprung. I have heard #that sometimes guys took the upper pivot body of the Sport and mated it #to the Gran Sport so that it would pivot at the top like a Simplex does. # You'd set it up so the upper and lower springs balanced each other out #to keep the upper pulley closer to the cogs as you shifted.