They COULD work, I think. I have a C'Dale and 450R as you can see. I have +2 arms on the Dale that I took off before I sold them and tried them w/the 450's. You could make them work but you will need to have some machining done for new bushings, spacers, and possibly work to the arms themselves or the frame. In other words, just buy some 450R arms and sell the Dale ones.Originally posted by 86atc250r@Sep 12 2004, 01:25 AM
No --- Cannondale arms are a very close match for a 400EX -- the 450R mount points are wider.