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this is the bike i bought, comes with street tires. they will do for basic off road though right? will drive mostly on road. can someone explain it in basic language - things like what size rims are best for on road vs off road. is there a good middle of the road tire, good for both on and off road or mainly one or the other? also, i see they sell whole tire and rim sets - is it a simple thing to swap wheels back and forth?!