AVM hubs feature hardened nylon center is used instead of metal to keep you moving in the rare case of a hub failure.
Free-Wheeling Hubs (also known as Locking Hubs) are mechanical devices which disconnect the front wheels from the drive train during all the time that 4-wheel drive is not needed (average over 95% of the vehicle's life).
Substantial fuel, parts and tire savings result, since axle shafts, differential gears, universal and C.D. joints, drive shafts, etc. remain absolutely motionless. Driving comfort is also greatly enhanced in 4x2, while the vehicle's original 4-wheel-drive traction capabilities remain unchanged.