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The only problem I saw with them was the tyre clearance, getting a genuine 2.4 tyre in the dropouts can be a problem in winter. Don't know if that has been sorted now.
Clearance is not overgenerous for sure. 2.35" Hans Dampfs - which come up stupid big - go in mine with a few mm to spare around the chainstays. Not a whole lot of mud clearance but in the winter it only sees trail centres anyway and they tend not to be full of the stuff that really gums your bike up.
I've got a steel slackline in 853. It's a bomber bike that loves it the burlier & rowdier it gets, trail wise. It'll handle anything one might have the balls for, far beyond what I could push it to.
Swapped out my Sektors recently for longer travel in a Lyrik so have taken the frame to the maximum the frame will handle and it rides even better than ever, even on more pedally cross-crountry stuff.
The only problem I saw with them was the tyre clearance, getting a genuine 2.4 tyre in the dropouts can be a problem in winter. Don't know if that has been sorted now.