3V Shimano

The Shimano Nexus hub combines the best characteristics of your old 3-speed and takes away the worst thanks to modern materials and technologies,” writes bicycle guru Sheldon Brown on his website. The Nexus technology enables to change gears seamlessly while stationary and, combined with the polyurethane 1312x12mm PU H8M C-Drive belt, always guarantees precise smooth gear changes. It is water and dirt-proof as all mechanical parts are sealed within the hub in a permanently-lubricated environment. It is a stable technology, thoroughly tested and perfected so much so that it was chosen by some of the leading bike-sharing services in the world.