I wanted something light for my trail bike as I was keen to shed some weight on a lovely light new build, and also wanted to run faster than my trusty Minions and run tubeless. So I read that Nobby Nic was light, grippy, fast, and tubeless ready so I bought these in 26x2.25, and weighed in super light at 560 grams. At 57-559 erto I thought they'd be fairly wide at least, like my Schwalbe Table Tops which have the same rating on my 4x bike, yet somehow they measured up narrow mostly because the knobs are inside the carcass footprint and do not protrude over the edge like a regular tire. They blew up tubeless on my Spank Oozy rims very easily with two wraps of tape and one cap of Stans.
I'm addicted the speed of these tires, I can keep up with local hard-tail riders on semi-slicks, but the first few runs in some really rocky and thorny places showed the limitations at 30psi front and 35psi rear the bike was bouncing all over the place and the rear got very worn and I half ripped some knobs off the rear, also thorns were constantly lowering the tire pressures when they got stuck in the tire, when I pulled them out Stans would then seal the hole properly. On the front the tire was very easily overwhelmed and pretty scary in rocky and loose terrain, that was until the pressure dropped to around 17.5psi (digital gauge) due to constantly losing pressure due to thorns, and the tire then conformed to the trail and was pretty good, although slow like a Supertacky Maxxis or Nevegal. At a safer for my rims 25psi the tire was OK, but I was missing my Minion on the front on this kind of terrain, as a Minion can grip at even 30-35psi.
For me at least I'd consider buying this tire as a rear only in the double defense version, as my local trails are mostly too abusive, but with the climbing ability and speed it might be worth it, or might switch to the tougher Smart Sam. On the front I think I'll go for something tougher and grippier like a Hans Dampf or a Minion when it's properly tubeless ready.