You have to position the rear wheel just right on hub gears or you have to re-adjust them.
Was your accident due to chain falling off or an empty-free spot in the gears?
You have to adjust the gears every time you take the rear wheel out, because you have to disconnect the cable. Second gear does seem a bit absent, though - not sure what's going on inside the hub.
You have to adjust the gears every time you take the rear wheel out, because you have to disconnect the cable. Second gear does seem a bit absent, though - not sure what's going on inside the hub.