I would also NOT buy the TKC70 - i have a separate wheel-set with the Michelin T63's on it for the dirt and Michelin Anakee's III for the street.

Many swiss and german colleagues ride the T63's on and off-road.

cheers from south, Andy

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2008 660Z with many many mods
1985 600Z in white/red with nearly no mods
1992 TT600 59X in black for the real dirt