Pneumatic element for an agricultural tool comprising a rigid base

An agricultural tool element comprising:

• a non-inflated tire with a tread and a pair of sidewalls each connected to the tread at a respective first end portion;
• and
• a rigid, generally annular base, by which the tire is fitted on a rotary support of an agricultural tool,
• wherein the sidewalls are each over-molded on a peripheral portion of the rigid base at a second end portion, opposite the tread,
• wherein the second end portion of the sidewalls is formed at least partly in a radially inner groove in the tire, the peripheral portion of the rigid base comprises a rib, and the groove and the rib are arranged with correspondence of form relative to one another,
• wherein the rib projects from an outer face of the rigid base,
• wherein the rib includes first and second flanks extending substantially radial and a top connecting the first and second flanks,
• wherein the sidewalls abut the first and second flanks along an entire height of the first and second flanks of the rib, and
• wherein the tire includes a chamber delimited by the tread, the sidewalls, and a median portion connecting the sidewalls, and the median portion abuts the top of the rib such that the chamber is entirely disposed radially outward of the top of the rib.