Pinion transmissions are centrally integrated into the bicycle frame at the bottom bracket and are completely encapsulated. This makes them very low-maintenance and low-wear. Just like a car transmission, the Pinion transmission is also very reliable and designed for long durability, there are no gear overlaps and the shifting is very fast and precise. Pinion offers transmissions with 6, 9, 12 and 18 gears and the widest range of ratios compared to other chain or hub systems.