There's more Mg content in the RS wheels, so they are lighter. Not really recommended for street use, because they are very susceptible to fracturing if you hit pot-holes etc.

If you have good roads, or are willing to take the risk, they will fit the NSR without much hassle. You may want slightly different spacers, I can't recall off hand, and I don't have my HRC book here, but yes, they will fit.
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Andy.
NSR-WORLD.COM

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