no problems using SKS (x3 rear, shockboard/blade front) w/ my 26 x 2.35 big apples, not great coverage in the rear, but I put an extension on the tail for a bit more coverage... now if only I can stop the rear from slowly drooping down while riding.
also, on my commuter mtn bike w/ rear rack, the shwalbe's just fit under an acerbis fender. It's one of those that snaps onto the seattube, then I zip-tied it to the rear bridge, and it just fits btw the rack and the tire (as well as a 2.35" kenda knobby).
*this one looks pretty much like the sks beavertail*
I run 45mm wide fenders on my Double Cross and they're a good fit for 'cross knobbies. I believe sks makes at least one size wider, and possibly two. You might check Performance if you can't find them locally.
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