49 C.F.R. § 570.10
(a) Wheel integrity. A tire rim, wheel disc, or spider shall have no visible cracks, elongated bolt holes, or indication of repair by welding.
(b) Deformation. The lateral and radial runout of each rim bead area shall not exceed one-eighth of an inch of total indicated runout.
(c) Mounting. All wheel nuts and bolts shall be in place and tight.
[38 FR 23950, Sept. 5, 1973, as amended at 39 FR 12868, Apr. 9, 1974]