A condition in which the bead unseats because a tire was run while flat. Also, the sudden loss of air due to side forces, such as hard cornering, combined with underinflation. The safety ledge on passenger rims (a necessity for tubeless mountings) guards against a roll-off.
TIRE ROLL-OFF
Meaning of TIRE ROLL-OFF in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012