I've been shopping for some new tires lately and have seen that several manufacturers make 2.0 XC tires that they boast have several World Cup Wins! I know that the tires are light, but they seem squirrelly to me. I am running a Geax Saguaro 2.0 on the back right now. It is great on hard pack, but if I get into marbles or sandy trails the back end seems to move around and loose grip. I am still running a 2.1 Karma on the front and am really impressed with it. I can't seem to wear it out and I am confident that it holds in corners, no matter what the trail condition.
I always thought that I could run a thinner rear tire and keep the weight and rolling resistance down. Now I'm wondering if its worth 100 grams? What do you guys think?