IIRC I had one supplied with my Multitec. Other visor designs are produced.
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There is a legal requirement for at least 50% light transmission, ie a max reduction of 50%. However, Mr Plod doesn't seem interested, unless it contributes to an accident (eg worn at night). I believe that is measured at any point, not a grand average over the full visor area.
TDM900A 2008/09 in use, with     Â
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CBX750FE in reserve; Cagiva N90 125 now rebuilt & in use.