I have now determined that my bike is a 1909 533cc export model. Found rims and beltpulley in Holland, have to ship to the UK, then reship to the USA as the vendor in Holland is afraid of our liability issues, as are the VMCC in the UK. NSU had a sales office in NY city by 1906. Abyone have any photos or parts books or anything to help me? Audi now owns the NSU trademark, but their archives are incomplete.