I put similar tires- 120/90-10 Michelin Reggaes on my old scooter and have been happy with the way they handle different terrain. http://farm9.staticflickr.com/8375/8...4f957262_b.jpg
I drove a 180 Riva when they first came out. Smooth and fast, got up to 55 really quickly.
Riding my Heinkel Tourists for 40 years and 105,000 miles