A pneumatic tire for motorcycles includes a carcass extending toroidally between a pair of bead portions, at least one ply of a belt layer installed outside thereof in the tire radial direction, and a tread portion radially outside the belt layer. The silicon structure includes a central portion and Fins extending from ends of the central portion. The height of the protrusion portions on the surface of the substrate is uniform. Flux is therefore transmitted between the stator 52 and the shaft 16 through the regions 54, preferentially through the high permeability regions 54a. A migration policy may be used to determine how long to cache the data in the write cache before migrating the data to the SDD. Also provided are methods for preparing, compositions comprising, and methods for using compounds of formulas I-III.