I see a lot of minimal, fixed-gear bikes around town, ridden by urban hipsters -with mudstained cargo pants.
This is because they refuse to spoil the aesthetic of their bare-bones rides with anything as utilitarian as a mudguard.
Today’s invention is therefore a covert mudguard. It takes the form of a transparent plastic cylinder split along its underside.
This fits inside the crossbar, which is open at the rear end.
On wet days, the rider extracts the cylinder just far enough for it to spring outwards a little laterally and thus form an effective deflector for the flying street grime.