The width, offset and inner and outer barrel sizes on vintage JDM wheels were one of those things I always thought were somehow correlated, but never invested time into this. I ran into a very interesting classified ad on Yahoo Auctions for some SSR Formula Mesh wheels, and it caught my attention because of the sizes. I started to investigate and ran into an article on Kaido Racer blog, explaining the SSR size. Thanks to their article, it all became much clearer now how there is a relation between wheel size, offset and type.
