[jspatz1]

Hey Grease Monkeys....judging from the TRR results, I guess you got that chain fixed!

Moving to pneumatic shifting is a change I would encourage for you. Obviously their is a small cost in weight and complexity with a new valve, cylinders, and lines, but the improved responsiveness and reliability is worth it. Regarding the risk of breaking the dog pin/screw I would make two suggestions. If you have dogs with screws, convert them to pins by drilling out the dog and shaft, and use a mil. spec. roll pin. The threads on the screws simply provide a fracture point that will fail eventually. As for the shock induced by air shifting, minimize it by adding speed controls to the cylinders (both directions.) They can be adjusted to eliminate the harsh hammer while still giving quick responsive shifting. A regulator could be used instead to reduce the pressure of the shifting air, but this reduces the reliability of both the valve operation and the shifting. Better to soften the motion with speed control and still maintain reliable force.