The new Scott Genius carbon is under 5 pounds with shock, but I think it's a stupid gimicky bike. Also, it actually has 150mm travel.
I reckon Cannondale Scalpel carbon would be pretty light. It has 110mm (4.3in) travel and comes in 15.9". The Rize would be a light 5" travel frame but the smallest size is 17". Sorry, I guess I haven't helped.
.....i hear and i tend to always crash on rocks. 'never learned not to look where you don't want to go and with that said, carbon frames are out of my jurisdiction and financial clout...tnx....and BTW any information here might be helping someone else...
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