im confused as to why this would make a difference (it being a langster). they have a 68mm shell, which is the basic. you could throw the ultegra crank on, but with the upgrade of the chainring, it'll probably cost as much as a regular track crank. just throw like a sugino 75, with sugino 75 bb. or whatever you would like. even a dura ace track crank if you wanna stick with shimano. I just read a review for the langster, and the guy says he has that setup (the sugino). but im sure any other combo would work too. but try e-mailing the tech. support dept. at specialized to see if they have any special things going on down there that i cannot see. good luck