Systems and methods for seamless retrieval of coupons and other non-standard items to a mobile device. The present invention provides: a process for producing a fiber, comprising: melt-extruding polyhydroxyalkanoic acid to form a melt-extruded fiber; rapidly quenching the melt-extruded fiber to the glass transition temperature of polyhydroxyalkanoic acid +15\xb0 C. The lean sensor is installed at a position above a bottom end of a baseplate of the seat of a saddle-ride type four-wheeled vehicle. There may also be a longitudinal torsion rod that extends perpendicular to the transverse torsion rod, so as to permit the rim to deflect downwardly about axes that extend both parallel and perpendicular to the backboard.