Tire

A HIGH LOAD CAPACITY tire specified in the ETRTO STANDARDS MANUAL 2021, the tire comprising:

• a pair of beads;
• a carcass extending on and between the pair of beads;
• a pair of sidewall layers axially outward of the carcass;
• and
• a belt radially outward of the carcass, wherein
• the pair of beads each include a core and an apex radially outward of the core,
• the carcass is composed of a carcass ply, the carcass ply including:
• a ply body extending between the cores, and
• respective turned-up portions connected to the ply body and turned up at the respective cores,
• each radial height of the turned-up portions is not greater than 17% of a cross-sectional height of the tire,
• the radial height of each of the turned-up portions is defined in a radial direction from a bead base line to an end of the turned-up portion,
• an average thickness F of the sidewall layer in a zone where a distance in the radial direction from the bead base line is 20 mm to 30 mm satisfies the following formula (1) represented using a constant B and a cross-sectional width SW of the tire and a width BW of the belt obtained in a reference state where the tire is fitted on a standardized rim, an internal pressure of the tire is adjusted to 290 kPa, and no load is applied to the tire,
• the constant B satisfies the following formula (2) represented using an aspect ratio RA of the tire,
• 416
• ×
• (
• BW
• /
• SW
• -
• B
• )
• 2
• +
• 4
• ≤
• F
• ≤
• 4
• ⁢
• 1
• ⁢
• 6
• ×
• (
• BW
• /
• SW
• -
• B
• )
• 2
• +
• 6
• ,
• and
• formula
• ⁢
• (
• 1
• )
• B
• =
• 0
• .
• 8
• ⁢
• 4
• ×
• (
• -
• 0
• .
• 4
• ⁢
• 9
• ×
• RA
• /
• 100
• +
• 1.22
• )
• ,
• formula
• ⁢
• (
• 2
• )
• the radial height of each of the turned-up portions is not less than 10 mm and not greater than 20 mm,
• an angle of each of the turned-up portions with respect to the radial direction in the reference state is not less than 15 degrees and not greater than 25 degrees, wherein the angle is defined by a vertex at a first position at the end of the turned-up portion, a first straight line from the vertex through a separation point at which the turned-up portion extends radially outward from a core of the bead, and a second straight line extending radially inward from the vertex,
• the belt includes a plurality of belt cords aligned with each other,
• an angle of each of the belt cords with respect to an equator plane in the reference state is not less than 20 degrees and not greater than 32 degrees,
• each of the sidewall layers includes a sidewall body and a clinch, the clinch being between the sidewall body and a chafer in which the corresponding one of the beads is provided,
• a portion of the clinch within the zone constitutes a thickest part of the clinch, and
• a combined thickness of the sidewall body and the clinch at an upper limit of the zone is greater in thickness compared to a first thickness of the clinch at a lower limit of the zone and compared to a second thickness of the clinch at a point of intersection of a radial center line of the zone and an outer surface of the tire,
• a straight line passes through a first position on the outer surface of the tire at the upper limit of the zone, a second position on the outer surface of the tire at the lower limit of the zone, and a third position on the outer surface of the tire at the point of intersection, and
• for the combined thickness at the upper limit of the zone, the sidewall body and the clinch each have non-zero thickness values.