1-1/4″ bore American pattern wheel hubs come complete with 1/4″ hardware and are drilled and tapped for both 1/4″ & 5/16″ bolts. Wheel hubs come complete with 1/4” hardware and are drilled and tapped for both 1/4” & 5/16” bolts. These hubs are made of aluminum and have an approximate outer diameter of 3″.  3 bolt pattern on a 2-1/2″ bolt circle Shoulder diameter- 1-3/4″1-1/4 Rear Wheel Hub