Believe it or not but the titanium single speed no rack, mudguards etc. Brompton weighs in at just under 9kilos or under 19 lbs. My S1E which is a single speed without TI is about 22lbs.
As far as other folders not staying together when folded just carry a piece of Velcro with you as i did with my Dahons and strap it together,very effective.
Last edited by ddez; 06-16-10 at 09:15 PM.