The tires look decent. They still have a driveable amount of tread. But they are old and worn, and they don’t have great traction in slippery conditions. Meanwhile, all four have slow leaks, making it tougher to jump into the truck for quick trips when needed. So that means new tires are in order.
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I’ve never changed tires by myself before, but it sounds like there’s a decent chunk of money to be saved by doing so, so the plan is to give that a try.