I've got a 756 with about 10 rides on it and it has started to chunk. I've been riding only on MX tracks that only have the occasional rock here or there. It's not like I've been riding in the dez on a buttload of rocks. It's still hooking up good (i.e. I holeshot 3 out of 4 motos last weekend) but I'm wondering if maybe anyone else has noticed chunking in similar conditions? Maybe it's chunking when it spins over the starting gate?????? The new Maxxis IT rear has been rated outstanding, I may give it a try for hook up/durability next.