18" Diameter - 17" Double Step Lip / Straight Flange Inner Halves:
Assembly Hole Pattern / Hole Sizing for M8 Bolts: 40 XØ8.5mm Equally Spaced.
Rim I.D. @ Bolt Flange: 15.500" / Bore: 13.900" / Bolt Circle: 14.580"
Bolt Flange Thickness: 0.180" +0.010/-0"