Just received the Tusk Ground Wire. It looks and feels fantastic, finally a tire that's designed for the rear tire of a Sur Ron. Hurry and order one, there going to be sold out everywhere fast!!!

So far I just have a few miles of pavement and dirt and I'm comparing to the stock tires.
Rider: 200 lb, 5'11" Vet rider.
Ease of mounting: Front and rear are very easy with stock tubes. Fairly tough with a ultra HD tube. I'd recommend a medium duty tube.
Build Quality: Very good!
Front tire impressions: The side knobs are the star of the show here. The stock tires side knobs aren't sufficient and slip unexpectedly under heavy turning.
Pavement impression: Sticks good, no complaints.
Hard pack with trace of sand on top: Good traction and slides predictably with good braking. Impressive!
Moist hard pack (hero dirt): sticks almost as good as pavement.
Light mud: Self cleaning.
Sand: Hard to say. See rear impressions on sand.

Rear tire impressions: Big center knobs provide gobs of traction. Med/soft rubber compound The stock tires center knobs don't have enough bite on lose surfaces.
Pavement impression: Sticks good, no complaints.
Hard pack with trace of sand on top: Good traction and slides predictably with good braking. Slide rate matches the front so they slip in unison. Impressive!
Moist hard pack (hero dirt): sticks almost as good as pavement. Chucks dirt.
Light mud: Self cleaning, chucks mud. Expect to get dirtier with this tire
Sand: Digs without much forward propulsion. Probably would work better with a lighter rider.