The GPR's are still in production, and both are road legal. The 70 is mega sticky and will consequently wear quickly, whereas the 80 is harder so lasts longer but won't stick so well.

The 70 isn't so good in the wet, as there's lots of rubber and not much tread!

That bike is my one and only NSR, and is now back in road trim.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball