I used to be someone that ran the lightest and fastest rolling tires I could get almost no matter what the situation. I valued the lightweight more than the protection and insurance of reinforced sidewalls and the ability to run lower pressure that comes with a stiffer sidewall preventing you from getting tire squirm at low pressures. I for one will be the first to say that the new direction of wider rims and higher volume tires is better in basically every way than the older narrower thin wall lightweight stuff for XC. I have these Aspen 2.4s mounted on 30 mm internal width rims. I have about two weeks riding on the 2.4s so far and the balance of traction, ride quality, speed and security is second to none. I've been running 15F16R which seems to work very well on mixed conditions of hardpack, loose over hard, and sand with a few rocky and rooty sections. The ride comparison to the 2.25 Maxxis casings is stark, as it's much easier to find a pressure that has good traction, ride and doesn't rim strike on every big root or rock. I am not running liners at this time which I thought I might have to but so far I haven't had a rim strike yet. I'm going to keep running these on both my hardtail and 110mm full suspension and see if there's any condition (other than mud or ice for obvious reasons) where these aren't my favorite. So far they absolutely rock.