If the frame came from a stolen recovered bike, and the frame number had been ground off, would anyone know where it came from? More importantly how could a 900 frame give any advantage over the frame from a lesser bike? I can't see this class being concerned by "built in" chassis flex somehow!
AND, if one were to run a frame with thicker tubing, surely that would give a weight disadvantage?
Methinks maybe some folks are getting a wee bit too wound up about the rules here.
[Edited on 19-1-2005 by yeti]