Upgrade your air fork with the most advanced MTB spring system ever created. Why coil Because nothing beats a coil when it comes to small bump sensitivity, traction and mid stroke performance. With the 3 point system you get all the benefits of both coil and air spring systems in one package. Precision wound coils from high tensile CrV Sl suspension spring wire come in 7 spring rates in 5lb increments sold seperately USE UP 6010,UP 6012,UP 6014,UP 6016,UP 6018,UP 6020 and UP 6022 . Air Bump Stop cartridge is adjustable from 5 50psi to dial in the level of end stroke and bottom out control. Please refer to https //www.pushindustries.com/pages/ac3 support for how to videos and spring rate guides Upgrade your air fork with the most advanced MTB spring system ever created Why coil Because nothing beats a coil when it comes to small bump sensitivity, traction and mid str With the 3 point system you get all the benefits of both coil and air spring systems in one package. Precision wound coils from high tensile CrV Sl suspension spring wire come in 7 spring rates in 5lb Air Bump Stop cartridge is adjustable from 5 50psi to dial in the level of end stroke and bottom out