Bought this tire as a replacement for my Nobby Nic in the rear. I was looking for a tire I could use in the spring mush until the trails dry out and I can put a better rolling, lighter tire on. So far I've been impressed...the only time it's lost traction is in the deep muck. Other than that, it climbs like a champ in the loose, muddy stuff and grips well in the tight, fast turns. Always seemed that the Nobby Nic would come loose going around corners too fast. Not with the HD. Thus far, I've only lost traction once, over a rock hump that has only 1 good line over it. I think this is a great AM tire, that can be used for XC and even XC races in the muddy stuff. I put about 25 psi tube on it. It's on my 2013 Cannondale Jekyll, riding a Big Betty up front. Once the BB is finally shredded, I fully intend to buy another HD trailstar for the front. Once things dry out, I'll runn a Kenda Slant Six in the rear, and will be putting HD up front. I'll add more to this review for front performance.