# US 2013/0153111 A1 · Pneumatic tire for two-wheeled vehicle

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- Number: US 2013/0153111 A1
- Document ID: US20130153111A1
- Status: Published application
- Kind: A1
- Application number: 13/819,176
- Filed: 2011-08-26
- Published: 2013-06-20
- Earliest claimed: 2010-08-27
- Assignees: Bridgestone Corporation
- Inventors: Naoya Muramatsu; Tooru Ubukata
- Web page: https://patentgrep.com/patent/US20130153111A1

## CPC

- B60C 11/0302: {directional pattern, i.e. with main rolling direction}
- B60C 9/18: Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C 9/22: the plies being arranged with all cords disposed along the circumference of the tyre
- B60C 11/00: Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C 11/005: {with cap and base layers}
- B60C 11/0075: {with different base rubber layers in the axial direction}
- B60C 11/0041: {comprising different tread rubber layers}
- B60C 2011/0025: {Modulus or tan delta}
- B60C 2011/016: {different rubber for tread wings}
- B60C 2011/0334: {Stiffness}
- B60C 2200/10: for motorcycles, scooters or the like
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

Provided is a pneumatic tire for a motorcycle which does not produce a failure such as early wear or uneven wear and which has improved grip while turning. The pneumatic tire for a motorcycle is a pneumatic tire for a motorcycle including a ring-shaped tread portion. The tire has, inside in the tire radial direction of the crown portion, at least one spiral belt layer having a width narrower than the width of the tread portion; at the shoulder portion of the tread portion, an inner layer rubber having a smaller modulus at 300% elongation at room temperature than that of a surface layer rubber is arranged; the inner layer rubber extends to a buttress portion; and the range of the ratio of the moduli between the inner layer rubber and the surface layer rubber is from 0.3 to 0.9.

## Claims

### Claim 1

A pneumatic tire for a motorcycle comprising a ring-shaped tread portion characterized in that
the tire has, inside in the tire radial direction of the crown portion, at least one spiral belt layer having a width narrower than the width of the tread portion; at the shoulder portion of the tread portion, an inner layer rubber having a smaller modulus at 300% elongation at room temperature than that of a surface layer rubber is arranged; the inner layer rubber extends to a buttress portion; and the range of the ratio of the moduli between the inner layer rubber and the surface layer rubber is from 0.3 to 0.9.

### Claim 2 (depends on 1)

The pneumatic tire for a motorcycle according to claim 1, wherein the modulus of the inner layer rubber is from 2.0 MPa to 10.0 MPa, and the modulus of the surface layer rubber is from 5.0 MPa to 15.0 MPa.

### Claim 3 (depends on 1)

The pneumatic tire for a motorcycle according to claim 1, wherein the inner layer rubber is arranged outside in the tire width direction from ½ of the half-width of the tread portion from the tire equator.

### Claim 4 (depends on 1)

The pneumatic tire for a motorcycle according to claim 1, wherein the thickness of the inner layer rubber at the tread portion is from 40% to 80% of the total thickness of the tread portion.

### Claim 5 (depends on 1)

The pneumatic tire for a motorcycle according to claim 1, wherein the width of the spiral belt layer is from 50% to 90% of the width the tread portion and the end portion of the spiral belt layer is arranged adjacent to the inner layer rubber.