i ve just looked into fitting a cbr 600 rear wheel to my cbr 400 and the main problem seems to be the width of the hub
i spoke a guy who has done it he has a long background in engineering he reckoned it needed a lot of very accurate machining and he had alot of troubles getting the rear disc /caliper to line up
so i can only assume the same problems would occure with the nsr as the rear ends are very similar
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