Rubber-cushioned inside steel bar absorbs road shock and provides torque action that improves load handling, reduces shock transfer and trailer sway 1-pc. forged spindle/arm. Eliminates springs, shackles and U-bolts. Designed to maintain accurate toe and camber. Each rubber torsion trailer axle comes cambered. Start Angle 10 Above, Weight Capacity lbs. 3,500, Cambered Yes, Inner Bearing Size in. 1 3/8 I.D., Frame Width in. 64, Seal Size in. 1 23/32 I.D., Axle Tube Type Square, Brakes Included No, Track Length in. 78 1/2, Overall Length in. 83 1/4, Outer Bearing Size in. 1 1/16 I.D., Hubs Included No, Bracket Type Standard 1-in. above tube.