yep, Maxim's got it right - for a single disk set-up you'd want a 16 x 18 (http://www.yoyodyneti.com/ProductInfo.aspx?productid=10.4760.80) - you'd need a brake switch too if for the street. I too have a 19 x 18 Brembo radial on the NSR and in addition to poser points, it is very sweet - really good feel and a tad more power. In fact I put these on all my bikes (all 2 of them that is).
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-Jim
'93 MC21