6" Wheel, Steel, Assembly With 5/8" BB Flanged Hub With Bolts, 4 1/4" Total Width Wheel flange has 90MM (3.54")bolt circle Sprocket flange has the industry standard 2-7/8" bolt circle Total width of hub is 2-5/8" Total width of wheel is 3-1/2" Total width of Assembly is 4-1/4"