Quality, spin nice and true. I think they'd be good on blacktop. I found them a bit slippy on my clay track, but it has a lot of loose dirt and is a rough surface. They aren't showing any signs of wear after about 6-10 packs on them. Seem like a hard compound, very little rolling resistance. Sidewalls are fairly compliant, tread area is stiff, makes sense given they are belted I suppose. These are the only belted tires I own. They're about a 1/4-3/8" narrower than the Fortress.How are those mirage tires?