# US 5,332,016 A · Pneumatic tires with sidewall recesses > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,332,016 A - Document ID: US5332016A - Status: Granted - Kind: A - Application number: 07/774,224 - Filed: 1991-10-10 - Granted: 1994-07-26 - Earliest claimed: 1990-10-16 - Assignees: Bridgestone Corporation - Inventors: Makoto Tsuruta; Hiroyuki Iida; Yasuhiko Kobayashi; Hiroyuki Koseki - Web page: https://patentgrep.com/patent/US5332016A ## CPC - B60C 13/02: Arrangement of grooves or ribs - B60C 13/00: Tyre sidewalls; Protecting, decorating, marking, or the like, thereof (B60C17/08 takes precedence; tyre shoulders B60C11/01; removable tyre sidewall trim rings B60B7/01) - B60C 15/024: Bead contour, e.g. lips, grooves, or ribs - Y10T 152/10819: Characterized by the structure of the bead portion of the tire - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A pneumatic tire comprising a pair of beads, and a carcass ply consisting of a main body located axially inside the beads and outer ply portions extending along the main body of the carcass ply axially outside each of the beads. A number of circumferentially spaced recesses are provided in the outer surface of the tire between a radially outer end of each of the outer ply portions and a location corresponding to a maximum width of the tire, and the recesses has a depth equal to 1/10 time to 1/2 time as large as a thickness of those portions of the tire which are provided with the recesses. The inclined angle of a base portion of each of the beads is about 15.degree. relative to the rotary axis of the tire. In the tire, 0.4P.ltoreq.W.ltoreq.0.8P and B.ltoreq.0.06D in which P, B, W and D are a circumferential pitch of the recesses, a minimum distance between the adjacent recesses, a circumferential width of each of the recesses which is obtained by deducting the minimum distance B from the pitch P, and a diameter of a rim base, respectively. ## Claims ### Claim 1 A pneumatic tire comprising; a pair of beads, a carcass ply, said carcass ply having a main body located axially inside the beads and outer ply portions extending along the main body of the carcass ply and axially outside each of the beads, a number of circumferentially spaced recesses being provided in an outer surface of the tire between a radially outer end of each of the outer ply portions and a location corresponding to a maximum width of the tire, said recesses having a depth equal to 1/10 to 1/2 times as large as a thickness of those portions of the tire which are provided with the recesses, an inclined angle at a base portion of each of the beads being about 15.degree. relative of a rotary axis of the tire, wherein 0.4P.ltoreq.W.ltoreq.0.8P and B.ltoreq.0.06D in which P is a circumferential pitch of the recesses, B a minimum distance between the adjacent recesses, W a circumferential width of each of the recesses which is obtained by deducting the minimum distance B from the pitch P, and D a diameter of a portion of a tire located at a same radial level as that of a rim base of a normal rim when said tire is fitted and mounted to such a normal rim. ### Claim 2 (depends on 1) The pneumatic tire according to claim 1, wherein a radial length of the recess is set to not less than 0.3 times as great as a distance from the radially outer end of the turn-up portion to the maximum width location of the tire. ### Claim 3 (depends on 1) The pneumatic tire according to claim 1, wherein the circumferential pitch P and the circumferential width W are made constant in a circumferential direction. ### Claim 4 (depends on 1) The pneumatic tire according to claim 1, wherein the circumferential pitch P and the circumferential width W are varied in a circumferential direction. ### Claim 5 (depends on 1) The pneumatic tire according to claim 1, wherein a ratio of W/P is 0.410 and a ratio of B/D is 0.0297. ### Claim 6 (depends on 1) The pneumatic tire according to claim 1, wherein a ratio of W/P is 0.597 and a ratio of B/D is 0.0297. ### Claim 7 (depends on 1) The pneumatic tire according to claim 1, wherein a ratio of W/P is 0.794 and a ratio of B/D is 0.0297. ### Claim 8 (depends on 1) The pneumatic tire according to claim 1, wherein a ratio of W/P is 0.606 and a ratio of B/D is 0.0595. ### Claim 9 (depends on 1) The pneumatic tire according to claim 1, wherein each of said recesses are substantially rectangular shapes having a depth equal to 1/3 of the thickness of the tire at the location of said recesses. ### Claim 10 (depends on 9) The pneumatic tire according to claim 9, wherein each of said recesses has a radial length of approximately 45 mm.