Vanocker Canyon has very nice pavement, so nice you tend to ride it a bit faster than you should if you don't know where the real tight curves are.
Needles Hiway (87) and Iron Mountain Road (16A) are two roads not to miss, as well as 85 from the S. Dak./Wyo. border down through Spearfish Canyon (14A).
I plotted in 2slowwheels route into Mapsource and it lists Vanocker as a dirt road, yet the road is listed on the Sturgis Rally page as a good ride and the photos show pavement. I can't see many Harleys venturing down a dirt road and I will ride on dirt for a bit but not too far.
Is the road paved, and Mapsource has old info? The photos don't look like new pavement.
Vanocker Canyon has been paved for several years now.