It is pretty common to have the rims in a chrome clad steel and then the spokes are stainless steel. It eliminates the need for chroming the piddly little pieces of the spokes. Chrome can get pitted over time. Wash the wheels with car soap. Use a wire wheel brush. Cleaning and waxing the chrome with any good product on a regular basis will help keep away the pitting. Also, keep the wheels dry after use in the wet.
