I just put a 1987 SSP front derailleur on it and it works fine. It appears that if you use a 1985 or earlier SSP front derailleur then you need to use a 109mm BB and if you use a 1987 or later SSP front derailleur then either a 109mm or 112 mm BB will work. You can easily see by the angle of the arm on the front derailleur that the 1987 has a lot more travel to it.