Sadly, those Terra Grapplers wear down way too quickly. Mine showed signs of wear at 10k, very noticable by 20k, and ready for replacement at 25k. That's on 17's, good alingment and regular rotations. At 30k there was a noticable loss of traction. I've nursed mine to 41k, but they badly need replaced, and were worn to the point I had to recalibrate my speedo to be accurate (I don't drive my truck much, which is why I've procrastinated so long).
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