The Strida folding bicycle, captured in action in Tottenham Court Road. The unusual triangular design has a special appeal to bike nuts and gadget freaks generally. Advanced features include side mounted axles, disc brakes and a rubber drive belt instead of a chain. Designed by engineer Mark Sanders as a postgraduate project, it is elegant but of course flawed: it comes in one size and the taller you are, the less comfortable to ride because you end up right over the pedals, but tall enthusiasts will forgive that even if they don't want to ride it very far. Eye-catching on the road, it really comes into its own when you emerge from a Tube station with a bundle of aluminium tubes, and assemble them into a bicycle in about 30 seconds.