qtaroqhoji:1. Gear System An interlocking set of gears, called a planetary system, helps you ride
qtaroqhoji: 1. Gear System An interlocking set of gears, called a planetary system, helps you ride up a hill—or go faster on a flat. Depending on the gear, the driver unit either first spins outer ring gears, or the planetary gears deeper in the hub, rotating around sun gears near the center. In all, there are 11 combinations, offering a range that’s the theoretical equivalent of an 11-45–tooth cassette. (via How Do Internally Geared Hubs Work? | Bicycling Magazine) -- source link