Tubeless tire

A pneumatic tire comprising

• a tread portion,
• a pair of sidewall portions,
• a pair of bead portions with a bead core therein,
• a carcass ply extending between the bead portions and including a topping rubber layer, said carcass ply turned up around the bead core in each said bead portion to form a pair of turnup portions and a main portion therebetween,
• said topping rubber layer facing the inside of the tire and made of a butyl rubber compound containing at least 10 parts by weight of butyl rubber or butyl rubber derivative, a thickness of the butyl rubber compound measured between the inner surface of the tire and adjacent cords of the carcass ply being in a range of 0.2 to 1.0 mm,
• a belt disposed radially outside the carcass in the tread portion, said belt comprising at least one ply of monofilament cords laid at an angle of from 10 to 40 degrees with respect to the circumferential direction of the tire, each said monofilament cord consisting of a single filament,
• each said bead portion provided between the turnup portion and main portion with a bead apex extending radially outwardly from the bead core,
• an auxiliary cord layer disposed outside the carcass ply and rubberized with a non-butyl topping rubber compound, said auxiliary cord layer having, in each said sidewall portion, a radially inner end 13e spaced radially outwardly apart from the radially outer end 8e of the bead apex by a distance of 10 to 15 mm, said auxiliary cord layer extending radially outwardly from each said radially inner end 13e to a position beneath the belt at least,
• a radial height of the radially outer end 8e of the bead apex being in a range of from 0.15 to 0.55 times the tire section height,
• the radial distance between the radially outer end 8e of the bead apex and the radially outer end 6e of the turned up portion being not less than 5 mm, wherein
• the auxiliary cord layer extends continuously between the radially inner ends thereof.

A pneumatic tire comprising

• a tread portion,
• a pair of sidewall portions,
• a pair of bead portions with a bead core therein,
• a carcass ply extending between the bead portions and including a topping rubber layer, said carcass ply turned up around the bead core in each said bead portion to form a pair of turnup portions and a main portion therebetween,
• said topping rubber layer facing the inside of the tire and made of a butyl rubber compound containing at least 10, parts by weight of butyl rubber or butyl rubber derivative, a thickness of the butyl rubber compound measured between the inner surface of the tire and adjacent cords of the carcass ply being in a range of 0.2 to 1.0 mm,
• a belt disposed radially outside the carcass in the tread portion, said belt comprising at least one ply of monofilament cords laid at an angle of from 10 to 40 degrees with respect to the circumferential direction of the tire, each said monofilament cord consisting of a single filament,
• each said bead portion provided between the turnup portion and main portion with a bead apex extending radially outwardly from the bead core, and the radially outer end 6e of the turnup portion positioned radially inward of the radially outer end 8e of the bead apex,
• an auxiliary cord layer disposed outside the carcass ply and rubberized with a non-butyl topping rubber compound, said auxiliary cord layer having, in each said sidewall portion, a radially inner end 13e spaced radially outwardly apart from the radially outer end 8e of the bead apex by a distance of 10 to 15 mm, said auxiliary cord layer extending radially outwardly from each said radially inner end 13e to a position beneath the belt so that the auxiliary cord layer breaks in the tread portion beneath the belt.

A pneumatic tire comprising

• a tread portion,
• a pair of sidewall portions,
• a pair of bead portions with a bead core therein,
• a carcass ply extending between the bead portions and including a topping rubber layer, said carcass ply turned up around the bead core in each said bead portion to form a pair of turnup portions and a main portion therebetween,
• said topping rubber layer facing the inside of the tire and made of a butyl rubber compound containing at least 10 parts by weight of butyl rubber or butyl rubber derivative, a thickness of the butyl rubber compound measured between the inner surface of the tire and adjacent cords of the carcass ply being in the range of 0.2 to 1.0 mm,
• a belt disposed radially outside the carcass in the tread portion, said belt comprising at least one ply of monofilament cords laid at an angle of from 10 to 40 degrees with respect to the circumferential direction of the tire, each said monofilament cord consisting of a single filament,
• each said bead portion provided between the turnup portion and main portion with a bead apex extending radially outwardly from the bead core,
• an auxiliary cord layer disposed between the bead apex and turnup portion in each said bead portion,
• a radial height Hs of the radially outer end 9e of the auxiliary cord layer being more than a radial height Ha of the radially outer end 8e of the bead apex, but less than a radial height Ht of the radially outer end 6e of the turnup portion,
• in a first region between the end 8e and end 9e, the thickness of rubber between the cords in the turnup portion and the cords in the auxiliary cord layer being in a range of from 0.2 to 0.5 mm,
• in a second region between the end 9e and end 6e, the thickness of rubber between the cords in the main portion and the cords in the turnup portion being in a range of from 0.3 to 0.8 mm,
• the height Ht of the turnup portion being in a range of from 0.4 to 0.60 times the tire section height,
• the height Hs of the auxiliary cord layer being in a range of from 0.3 to 0.50 times the tire section height,
• the height Ha of the bead apex being in a range of from 0.20 to 0.40 times the tire section height,
• the difference (Hs-Ha) between the height Ha and height Hs being not less than 10 mm,
• the difference (Ht-Hs) between the height Hs and height Ht being not less than 5 mm.