Provided is a narrow-width, large-diameter radial tire which is a passenger-vehicle pneumatic radial tire with improved wet performance and rolling resistance performance. The pneumatic radial tire for passenger vehicles of the disclosure is a passenger-vehicle pneumatic radial tire comprising: a carcass consisting of one or more carcass plies of radially arranged cords toroidally extending between a pair of bead portions; and a tread rubber disposed on a tire radial outer side of the carcass, wherein when the tire is assembled to a rim and filled with an internal pressure of 250 kPa or more, an SW/OD ratio of a sectional width SW to an outer diameter OD(mm) of the tire is 0.26 or less if the tire has a sectional width SW of less than 165(mm), whereas a sectional width SW and an outer diameter OD(mm) of the tire satisfy a relation of 2.135×SW+282.3≤OD if the tire has a sectional width SW of 165(mm) or more, the tread rubber has a dynamic storage modulus E' at 30°C of 6.0MPa to 12.0MPa and a loss tangent tanδ at 60°C of 0.05 to 0.15, and when a tread surface is equally divided into four regions in a tire width direction, and two regions on a tire widthwise inner side are each referred to as a center portion and two regions on a tire widthwise outer side are each referred to as a shoulder portion, a shoulder circumferential sipe extending in a tire circumferential direction is disposed in the shoulder portion.

Provided is a narrow-width, large-diameter radial tire which is a passenger-vehicle pneumatic radial tire with improved wet performance and rolling resistance performance. When the passenger-vehicle pneumatic radial tire of the disclosure is assembled to a rim and filled with an internal pressure of 250kPa or more, an SW/OD ratio of a sectional width SW to an outer diameter OD(mm) of the tire is 0.26 or less if the tire has a sectional width SW of less than 165(mm), whereas a sectional width SW and an outer diameter OD(mm) of the tire satisfy a relation of 2.135 ×SW+282.3≤OD if the tire has a sectional width SW of 165(mm) or more, a dynamic storage modulus E' at 30°C of the tread rubber is 6.0MPa to 12.0MPa and a loss tangent tanδ at 60°C of the tread rubber is 0.05 to 0.15, and a dynamic storage modulus E' at 30 °C of the buttress rubber is 1/2 or less, and a loss tangent tanδ at 60°C of the buttress rubber is 0.1 or less.

A pneumatic tire (10) is disclosed comprising a carcass (22) having at least one reinforced ply (14), and a reinforcing structure (400, 500, 610, 620, 630, 640, 710, 720, 730, 740, 810, 820, 830, 840, 910, 920, 930) providing a buffer for absorbing shear strain. A tread (12) is disposed radially outward of the carcass (22) and a belt structure (16) is disposed radially between the carcass (22) and the tread (12). The reinforcing structure (400, 500, 610, 620, 630, 640, 710, 720, 730, 740, 810, 820, 830, 840, 910, 920, 930) comprises at least one layer of a three dimensional fabric (420,520,613,623,633,643,713,723,733,743,813,823,833,843,913,923, 933) including or defining a frame structure of fabric and open cells (410, 510, 611, 621, 631, 641, 711, 721, 731, 741, 811, 821, 831, 841, 911, 921, 931) defined by the frame structure.

Fahrzeugluftreifen für einen PKW, Van oder Light Truck mit einer Radialkarkasse (3, 3a, 14) und mit zwei Wulstbereichen (11), welche wenigstens je einen Wulstkern (4), einen dem Wulstkern (4) aufsitzenden Wulstkernreiter (5) und einen den Wulstbereich (11) nach axial außen begrenzenden Wulststreifen (13) aufweisen, wobei die Radialkarkasse (3, 14) von axial innen nach axial außen um die Wulstkerne (4) geführt ist und in einem Karkasshochschlag (3a) endet und wobei die im Wulstbereich (11) angeordneten Bauteile Wulstkernreiter (5), Radialkarkasse (3, 3a, 14) und Wulststreifen (13) bestimmte Shore A-Härten aufweisen. Zur Verbesserung der Haltbarkeit des Wulstbereiches weicht die Shore A-Härte von axial unmittelbar benachbart im Wulstbereich (11) angeordneten Bauteilen (3, 3a, 14, 12, 13, 14, 15) nicht mehr als 5 Shore A-Härtepunkte voneinander ab.

A time-series waveform of tire vibration detected by an acceleration sensor is windowed by a windowing means, time-series waveforms of the tire vibration are extracted for respective time windows, and feature vectors of the respective time windows are calculated. Then kernel functions are calculated from the feature vectors of the respective time windows and road surface feature vectors, which are the feature vectors for the respective time windows calculated from the time-series waveform of the tire vibration obtained for distinctive road surface conditions calculated in advance. And the road surface condition is determined by comparing values of discriminant functions using the kernel functions. As a result, the road surface condition can be determined from the time-series waveform of the tire vibration without detecting peak positions or measuring the wheel speed. Moreover, robustness against changes in tire size can be added to the determination of the road surface condition.