Patent Number: 6,167,932

Title: Pneumatic tire for passenger cars having specified harshness factor

Abstract: A pneumatic tire for passenger cars which is improved in harshness noise without deteriorating the steering stability is disclosed, wherein a harshness factor HF is set in the range of from 3.2 to 3.5, the harshness factor HF is: R1 is a radius of curvature (in mm) of a crown part of the tread profile, R2 is a radius of curvature (in mm) of shoulder parts of the tread profile, and Kv is the vertical spring constant in kN/mm of the tire.

Inventors: Yamamoto; Akio (Kakogawa, JP), Idei; Mitsushige (Kobe, JP), Tagashira; Kenji (Kobe, JP), Yamashita; Fumikazu (Kobe, JP)

Assignee: Sumitomo Rubber Industries, Ltd.

International Classification: B60C 3/00 (20060101); B60C 11/00 (20060101); B60C 011/00 (); B60C 005/00 ()

Expiration Date: 01/02/2018