A tire (20) comprises a sidewall (21) and an attachment bead (23) extending the said sidewall (21) and designed to be attached to a rim of a wheel of a motor vehicle. A mould (10) for vulcanizing a tire comprises a lateral part (12) designed to mould the sidewall (21) of the tire and a lower part 13 designed to mould the attachment bead (23). The lateral part 12 and the lower part 13 at least partially delimit a tire receiving space (E) designed to receive the tire that is to be vulcanized in the mould (10). The mould comprises a slot (16) extending the tire receiving space (E) and the slot (16) is at least partially moulded by the lower part 13 of the mould (10).
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