Thanks prone. I think you are right about the front track. I saw a nifty video yesterday of people hanging rucksacks on the back of there bromptons which would work equally well with the mezzo so I think light touring can be cover one way or another. The bingos are 42 cm wide I think but I wonder if a dahon revolve stem would fit the mezzo. I notice some of the carbon ori models have compact drop bars and I have to admit that could be a tempting alternative to bullhorn bars if they will fit.