A thread on Compact Drivetrains in the Road Forum jogged my memory regarding the Shimano 10mm pitch Track stuff. I raced with a couple of guys who used this but couldn't remember the issues that lead to Shimano discontinuing it. Anybody remember or use this? Seems like a great marketing opportunity for the Road.
i have the group. i haven't found a frame worthy of mounting it on yet. apparently the basic idea was to make everything smaller and lighter. it worked, but IIRC, the UCI banned it a couple of years after it was introduced. i think a couple of the old-school trackies on the board may have more to say about it.