Hi Guys I really need some help.... I am trying to build a track tandem similar to the one I raced at the Beijing Paralympics and I am in desperate need of a chainring1/8 track chain that fits on a regular 9 speed ultegra crank. Im looking for a 51 or 53 but for now anything will be a great help. We used them when I raced before but after a few years they seem to have disapeared. If you can assist me that would be sucha great help Gavin
