Fifteen speed variable radius bicycle transmission
Flexible bicycle derailleur mount
Flexible sprocket variable ratio chain drive
Floatation and snow exclusion components for a suspension...
Foldable jack and/or baggage carrier for a snow mobile
Foldable wheel chair
Forward or reverse ratchet single or dual pedals/levers...
Four wheeled foot propelled balance steered toy vehicle
Freewheeling drive having forward, reverse and braking...
Front wheel drive cycle