Abstract: A piezoelectric tire can include a tire body, a coating type piezoelectric portion, and a circuit unit. The coating type piezoelectric portion can be coated on the tire body and can generate electric power corresponding to strain generated in a ground-contact surface of the tire body. The circuit unit can be provided to the tire body and can be driven by the electric power generated by the coating type piezoelectric portion. Since a coating type is used as the piezoelectric portion, the piezoelectric portion can be in close contact with the tire body.

Abstract: A tire pair 2 for a motorcycle includes a front tire 6 and a rear tire 8. A difference (F15?R15) between a camber thrust index F15 of the front tire 6 and a camber thrust index R15 of the rear tire 8 at a camber angle of 15° is equal to or greater than ?0.038 and is equal to or smaller than 0.038. A difference (F30?R30) between a camber thrust index F30 of the front tire 6 and a camber thrust index R30 of the rear tire 8 at a camber angle of 30° is equal to or greater than 0.038 and is equal to or smaller than 0.114. The camber thrust index F30 at the camber angle of 30° is equal to or greater than 0.570. A difference (F45?R45) between a camber thrust index F45 of the front tire 6 and a camber thrust index R45 of the rear tire 8 at a camber angle of 45° is equal to or greater than 0.076 and is equal to or smaller than 0.228.

Abstract: A pneumatic tire having an improved carcass structure capable of increasing the sidewall rigidity, the tire (1) comprising a carcass (8) composed of an inner carcass ply (9) and an outer carcass ply (10), the inner carcass ply having a pair of edges turned up around the bead cores (5) from the axially inside to outside of the tire, each turned up portion thereof extending radially outwardly beyond the maximum tire width point (B), a bead apex (6) disposed between the main portion and the turned up portion, the outer carcass ply having a pair of edges each disposed between the bead apex and each turned up portion of the inner carcass ply, the edges of the outer carcass ply terminated radially outward of the radially inner end of the bead core, each sidewall portion provided with at least one steel cord reinforcing layer (11a, 11b, 11c) made of parallel steel cords.