The efficiency depends strongly on the input torque and rpm and can therefore not be given in general terms with a numerical value. Concrete efficiency data from other sources should therefore be questioned critically. In contrast to internally geared hubs with (usually) three planetary stages connected in series, Pinion has only two gear stages, each optimized for maximum efficiency. In contrast to derailleur gears, the straight chain/belt path causes no loss of efficiency. Therefore, Pinion's efficiency lies on average between a high-quality internally geared hub and a new, perfectly adjusted and straight running derailleur. If a derailleur is dirty or worn and the chain runs at an angle, the efficiency of a Pinion gearbox is better in most cases.