Ns bikes metropolis 3 dirt jump bikens bikes metropolis 3 dirt jump bike is a solid performer hitting well about its price point the metropolis 3 dirt jump shares many of the same components as the flagship metropolis 1 such as the same cranks and cockpit the geometry has been dialled in by ns bikes pro team and comes with components such as rst dirt ra 100mm forks and kenda small block 8 21 tyres the metropolis 3 dirt jump bike has something for everywhere whether youre new to dirt ju