Drum trucks include: a spring loaded chime hook that automatically engages and holds drum securely for drum handling. Front Wheels have Pneumatic Tires 12n" diameter x 3 1/22" wide or Solid Rubber Tires 10s" diameter x 2 1/2s" wide mounted on aluminum rims with roller bearings and grease fittings. Rear Wheels on all models have polyurethane tires on axle mounted polyolefin hubs.