Pingel Premium Electric Over Air Shifter kits use beefy shift cylinders and switching valve assemblies applicable to Harley-Davidson motorcycles. The majority of the shift procedure is performed electronically, reducing air usage. Use one of our Pingel handlebar control assemblies found or wire into your horn button. 4-Speed transmission models require a 3" throw air shift cylinders. These kits are available with 7/8" or 1" handlebar brackets and with or without DOT approved air bottle.