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i have panaracer XCpro 2.1" tires on my 4500c. until now, i've never ridden any trails with a lot of ruits. but i just moved and the trails here are full of them. i was constantly losing traction. and i ran into a tree for the first time ever when i lost control going downhill. can i blame it on my tires? or am i just the worst mountain biker ever?