A burst into a rime hole would cause a starburst hole that is smaller than the rim socket because the tube shrinks when no longer inflated. Tire blow-off occurs most commonly on tandems where substantial energy of descending mountain roads is converted to heat in rims by braking, in contrast to a single bicycle, where most of the energy is dissipated by wind drag. Rim heating has two effects, of which increased pressure is probably the lesser one. Heat softens the bead of the tire so that it can squirm out of its clinching seat in the rim. Tire casing flex at the load point works the tire so that it squirms out of engagement.
Heat also increases lubricity of the bead against the rim to facilitate creep.
Formerly, base tapes made of a dense gauze-like tube, filled with Kapok, were offered for mountain tourists. This padding served as insulation to prevent the rim from heating the tube and increasing pressure. Short tubes, that must be stretched to fit on the rim, can cause tire blow-off. A stretched tube will occupy the space on the bed of the rim where the tire bead should be to make proper engagement with the hook of the rim sidewall. The tube under the bead of the tire can prevent proper engagement with a hooked rim to cause a blow-off even without great heat or pressure.