I run Heidenau K60 (60on/40off) tires. They're very good and grippy on tarmac and do an excellent job offroad. I've done some pretty serious offroading with my bike and the only way I could've done better was if I had used Continental TKC 80 off-road oriented tires.
So, for now and forever on: K60 FTW! As for sizind, default all the way. I see no reason in using a tire size the rim wasn't designed for. Most peeps using bigger wheels usually do so for looks alone. Not a good reason to compromise the balance of the bike.
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