Having just got home and having a peek, I don't think I've got the clearance for 2.4" with mud and snow in the mix! Rear derailleur cable routing is especially stupid. New frame time? ...
I've come off the xking and now on nobbly nics - tanwall, naturally - immediately more confidence inspiring and I'm either getting fitter or have noticed very little difference in terms of average speed/rolling resistance on the road.
I have 2x Maxxis High Roller 29x2.4s
Medium use.
You interested? Can post