Or. Admin. R. 437-004-3550
(1) Workers must use a safety tire rack, cage, or equivalent protection over tires mounted on split rims with locking rings or similar devices, when:
(b) Adding air to tires on or off the vehicle if the tire was run while flat or if the rim or locking device was disturbed in any way.
NOTE: A tire is flat if it has lost more than 50% of its normal pressure.
ORS 654.025(2) & 656.726(3)
ORS 654.001 - 654.295
OSHA 4-1998, f. 8-28-98, cert. ef. 10-1-98