Heavy duty radial tire with specified arrangement of chafer and carcass turnup

A heavy duty radial tire comprising

• a tread portion,
• a pair of sidewall portions,
• a pair of bead portions with a bead core therein,
• a carcass comprising a ply of cords arranged radially at an angle of from 70 to 90 degrees with respect to the tire equator extending between the bead portions through the tread portion and sidewall portions and turned up around the bead cores from the axially inside to the outside of the tire to form a pair of turnup portions and a main portion therebetween,
• a bead apex disposed between the main portion and each turnup portion of the carcass ply and extending radially outwardly from the bead core, and
• a chafer having a radially outer end and disposed in each bead portion to define a rim contacting surface,
• each said turnup portion extending radially outwardly beyond the radially outer end of the bead apex so that the turnup portion has a parallel part which is placed adjacent to and substantially in parallel with the main portion,
• said chafer extending radially outwardly along the axially outside of the turnup portion beyond the radially outer end of the turnup portion, and
• when measured, at the radially outer end of the turnup portion, the thickness T3 of the chafer being more than 1.7 times the maximum diameter of the carcass cords.