The bottom bracket appears to be 68 mm. The axle seems to be 110 mm by calculation. Someday, when I find the AD catalog I will scan it. Trouble is, I have not located the box that has some of my old bike/camera/audio related papers inside. I have found a Suntour Cyclone 7000 crankset that may work. Any ideas on upgrades for the stock Weinnman long reach brake calipers?