Have you seen Mayo's Orbea prototype climbing bike?
http://www.cyclingnews.com/tech.php?id=photos/2004/tech/probikes/euskaltel_orbea/mayo_ventoux21,can't imagine that drilled out Dura Ace 10 speed stuff saves that much weight,plus it looks 70's hideous!Why not get some light wheels for his rig instead,or are those Mavic Ksyrium wheels the best Mavic can offer in the way of light weight wheelsets at the moment?
One things for sure,this UCI weight limit is certainly counter productive,imagine what the teams could come up with with no limit to contend with?Drool........!