Walmart by where I live said they could replace 1 of my tires for me. However when I called Discount tire to get a price quote they said in 4 wheel drive vehicles you have to replace all 4 tires not just 1. I really dont want to replace all 4 tires since the other 3 are in great condition. Is this true about 4 wheel drives or is discount tire just trying to make more money?|||im not sure if its true or not. im going to say no, since i replaced 2 tires on my explorer at different times.
also, DONT use discount tires. i used them once and had a terrible experience. i told that to my sister when she was buying tired, also got majorly screwed. its called discount tires for a reason, and you definitely get what you pay for..... which is almost nothing!
now i only use goodyear. more expensive, but at least they get it done right.|||To be absolutely safe you should have the new tire shaved so the tread depth matches your existing tires.
Other than that it depends which car you have including what type of rear end and transfer case. Some setups are more tolerant of mismatched tires than others. If your other three tires are in great condition you can replace only one. A new tire has a tread depth of about 10/32 - 11/32. If your old tires have more than 8/32 you should be fine.|||Four wheel drive vehicles need the same size of tires in all four corners. The reason being that the gears in the differential will wear unevenly if you have two different size tires on the same axle. Just like a two wheel drive vehicle that has rear wheel drive requires that both rear tires are the same size for the same reason.|||you don't have to, but replacing all 4 will give you even wear on your tires and also spread the traction evenly on all four tires.
However, I'd just change the pair, and use the extra as a spare tire. This way they get pretty even wear, and you don't have to buy all new tires. You also have a spare.
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