Are there any major disadvantages to siping a mud terrain tire like BFG or Goodyear. Would they just be more prone to chipping? The reason I ask is they have 235/70r16 and 255/70r16 sizes. While I would lose power to weight, maybe I could save a little from going up to the 245/75r16 size.

I sipped my Goodyear MTR's 245x75R16's and it makes a big difference both on road and off. have about 10k on them so far. I had Discount tire do these, but I sipped the last set I had by myself.

I haven't had any chunking, took them to Moab this spring and have wheeled in the midwest a bit since then

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2005 CRD "Ol' Blue"
Red Ryder carbine-action, two hundred shot range model air rifle with a compass in the stock and this thing which tells time.
My build page- RL Komodo Rear and TJM Front Bumper, armored, lifted, JBA Steel D30, 4.10s and ARB air lockers.