I've had very good luck removing decals/stickers by heating them with a heat gun (preferred) or a hair dryer. 'Trick is to get it to the temperature at which the adhesive is soft, but not so hot that the decal/sticker does not tear apart. There is usually some residual adhesive left on the frame or wheel. Lacquer thinner will normally cut through this pretty quickly, but, as others have cautioned, you should try whatever solvent you intend to use on a part that will not show to be certain it won't damage the underlying finish.

Dean