I think riding my Quickbeam fixed on singletrack is fantastic fun. You'd be looking at cyclocross tires for the most part. David is right on with the clearance maxing out a bit over 40mm. I think I have my tire size greed under control now, but it's been 10 years of trimming side knobs and picking gears and chain length to get the over-fat tires centered right at the widest spot in the chain stays. Choosing narrower knibblies will let you move the axle further, which is going to give you easier gearing options. Off-road is when you're going to like the ability to roll a second gear for climbing! I really like the single sided switch - two rings, Dingle cog, quick release hub. Dismount, release the QR, slide the wheel forward, lightly reengage the QR. Shift the chain to the smaller ring or cog (depending on the gear your changing to), get the chain started on the bigger ring or cog, and roll the bike forward. Undo the QR, tension the chain, snug up the QR and ride away. Super fast, like 15 seconds. Especially if you have a Hunqapillar for geared fatter tired gear hauling, but even if it's your only woodsmobile, I think you'd have great fun on a Quickbeam. I don't know how you'd like the buzzing of a White Industries freewheel; the Shimano ones are quieter. Fixed is quietest of all. I think the flared drops we discussed elsethread are a perfect match for a Quickbeam. Once I put the WTB drops on, I've never taken them off.
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