I tried running a pair of Ritchey ZED 42c's on my 50cm frame and they just didn't work; too much time spent hitting my toes on the tires on the trail. Two excelllent off-road performers are the Vittoria EVO Cross in 34c or the Panaracer Fire Cross in 35c. Both of these are aggressive treads that roll well. I can just squeak my toes past them on turny singletrack and they ride much grippier than the width would make you think.
I have been running maxxis wormdrives. It looks they may have been discontinued but you can find 'em online. They roll pretty fast on the pavement and have great traction on the singletrack. Run 'em about 75 psi and go anywhere you want:thumbsup:
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