Big Rig tire balancers. Patented Centramatic Balancers are a unique line of "On Board" Balancing Systems for tires and wheels that maximize tire life and smooth your ride. Mounted behind the wheel they offer permanent solutions for balancing assemblies. Centramatic Balancers operate automatically and can adjust instantly for changing conditions. Free shipping. For 10 bolt 22.5″/24.5″ aluminum wheel 2011 and older  with 11.25 bolt circle. For steer axle with big drum brakes, (16.5″) or disc brakes  and Super Single. Over 12K axles. Two balancers. FREE SHIPPING