These carbon fiber axle spacers are a trick new addition to the Operation Carbon Kart from Speed Research Team! The photos show that a 1.5" long carbon fiber axle spacer weighs less then a .5" long aluminum spacer.
Shave the rotating weight of this part down to a third of what you are running now.
Comes in a kit of nine pieces (1" (2 pc.), 1/2" (3 pc.), 1/4" (4 pc.)