Section 570.63 - Wheel assemblies(a)Wheel integrity. A tire rim, wheel disc or spider shall have no visible cracks, elongated bolt holes, or indications of in-service repair by welding. (1)Inspection procedure. Examine visually for the conditions indicated.(b)Cast wheels. Cast wheels shall not be cracked or show evidence of excessive wear in the clamp area. (1)Inspection procedure. Examine visually for the conditions indicated.(c)Mounting. All wheel nuts shall be in place and tight.(1)Inspection procedure. Check wheel retention for the conditions indicated.