I have 20" ITP Holeshot HD's, the HD tread pattern has the blocks closer together which has better wear but they will fill up with mud faster than the Holeshot GNCC's which are spaced farther apart. At most places if you buy the tires off them they will mount them for free but if you don't buy the tires there I would expect them to charge around $10 per tires to change. They really are a pain to change.