# US 8,464,770 B2 · Pneumatic tire for motorcycle

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- Number: US 8,464,770 B2
- Document ID: US8464770B2
- Status: Granted
- Kind: B2
- Application number: 13/043,588
- Filed: 2011-03-09
- Published: 2011-06-30
- Granted: 2013-06-18
- Earliest claimed: 2007-06-07
- Assignees: Bridgestone Corporation
- Applicants: Hidemitsu Nakagawa
- Inventors: Hidemitsu Nakagawa
- Web page: https://patentgrep.com/patent/US8464770B2

## CPC

- B60C 11/00: Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C 11/0058: {with different cap rubber layers in the axial direction}
- B60C 19/001: {Tyres requiring an asymmetric or a special mounting}
- B60C 2011/0025: {Modulus or tan delta}
- 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

The tread portion 2 is divided in the tire widthwise direction into five regions comprising the center tread region A, respective shoulder tread regions C, and respective intermediate tread regions B. A curved length in the tire widthwise direction of a tread surface of the center tread region A is in the range of 10 to 35% of the curved length in the tire widthwise direction of the entire tread surface, and the whole curved length in the tire widthwise direction of a tread surface of the shoulder tread regions C is in the range of 5 to 35% of the curved length in the tire widthwise direction of the entire tread surface. 100% Mod, i.e. the modulus at 100% elongation, of tread rubber forming the intermediate tread region B is larger than 100% Mod of tread rubber forming the center tread region A, and loss tangent of each shoulder tread region C is larger than loss tangent of the center tread region A.

## Claims

### Claim 1

A pneumatic motorcycle tire, including a pair of bead portions each having a bead core embedded therein, a pair of sidewall portions extending from the bead portions toward the outer side in the tire radial direction, and a tread portion extending over the respective sidewall portions, characterized in that:
the tread portion is divided in the tire widthwise direction into five regions comprising the center tread region including the tire equatorial plane, respective shoulder tread regions each including a tread ground contact end, and respective intermediate tread regions each interposed by the center tread region and the corresponding shoulder tread region;
100% Mod of tread rubber forming the intermediate tread region is in the range of 1.3 to 2.1 MPa and larger than 100% Mod of tread rubber forming the center tread region; and
loss tangent of each shoulder tread region is in the range of 0.3 to 0.4 and larger than loss tangent of the center tread region;
wherein each intermediate tread region has a higher rigidity than both the center region and each shoulder region.

### Claim 2 (depends on 1)

The pneumatic motorcycle tire of claim 1, wherein a curved length in the tire widthwise direction of a tread surface of the center tread region is in the range of 10 to 35% of the curved length in the tire widthwise direction of the entire tread surface, and the whole curved length in the tire widthwise direction of a tread surface of the shoulder tread regions is in the range of 5 to 35% of the curved length in the tire widthwise direction of the entire tread surface.

### Claim 3 (depends on 1)

The pneumatic motorcycle tire of claim 1, wherein the sidewall portion includes an indication that the tire is for use as a rear tire of a motorcycle.

### Claim 4 (depends on 2)

The pneumatic motorcycle tire of claim 2, wherein the sidewall portion includes an indication that the tire is for use as a rear tire of a motorcycle.