You`ve got it now Nick. But, hubs are hubs. Rims and wheels are a separate deal. The proper name for what I need is "hub" - not to be confused with a rim or a wheel. Any search for a "hub" will illustrate what I need - only I want it in plastic. Steel hubs are heavy, made of metal and have metal bearings. Even a cheap metal hub is made to support many, many hundreds of pounds more than a set of catrax requires - not to mention the corrosion factor.