Bicycle Pedal Extenders for 9/16 Inch Cranksets (21mm Spacers) Bike Includes one Right and one Left Pedal Extender Use this set with any 9/16 in. threaded pedals to extend the pedal position outward by 21mm (0.825 in) Prevents knee strain and rubbing against the rear tire/frame for those with a naturally wide stance CNC machined from solid billet Chrome-moly steel Right and Left extenders are easily identifiable with unique L and R markings