Check out this folding single speed. It only weighs 12.6lbs and can easily carry a rider weighing up to 13stone 5 lbs. It folds up to 67cm x 30cm x 16cm which is roughly 26"x11"x6". The lightweight wheels provide such an amazing angle of incidence that you can easily attack pavement cracks with confidence. And with some strategically placed lead weights, you could even make this meet the minimum weight restriction for the Tour de France! GIDDYUP!