Ya I went to I think 12 straight bike weeks starting in the late 90s.The Needles are great, too! Most times I've been there have been during Rally Week, so the roads were always packed with bikes. Cruising to the Needles was a favorite destination, and extremely curvy, lots of pull-outs, etc. Had to take it pretty slow. Favorite photo location: The rock formation that looked like, well, certain male body parts. Do you know it? There's another right behind Rushmore. LOL. Spearfish Canyon wasn't quite as heavily traveled (almost), but wider roads and fewer hairpins (none?) so we could cruise better. At the end of the trip, Deadwood - ah, perfect place to kick back for a bit of fun - then back down the Canyon. I have two brothers living in Custer, so never lacked for a place to stay during Rally.
Yes I know that rock

I loved Needles because of how the highway was. Switchbacks, pigtail bridge, tunnels through stone. What was that lake? Sylvia Lake or something like that.
Loved heading out for the canyon rides and having my newbie friends think I was crazy for strapping my coat on the bike. After sunset when those temps dropped and they were all in t shirts I didn't look so crazy anymore.