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With AWD, the tire requirements when it’s snowing in the mountains are more relaxed compared to 2wd vehicles.

Just relaxed chain requirements in Washington.

However every time one of your tires goes bad you have to replace all four.

uhhh If one of your tyres is going bad then at least two need to be changed on all vehicles, and, more importantly, some investigation needs to take place why only one wheel is going bad (poor rotation strategy, wheel alignment, bad brakes... etc)

Punctures and pinches can take out one tire. As can psycho exes, teenagers whose parents didn’t raise them right, manufacturing defects. And the passenger side tires are more susceptible to sidewall damage from poor parallel parking.

The sting of losing two tires due to a mistake is a lot less than that of losing all four when three are still good. It’s one extra versus three extra tires.

That's still incorrect.

Replacing one tyre in those circumstances (which are quite different goalposts to the previous post) is possible via specialty shops that "shave" the new tyre down to match the other three

Insurance/offender will pay for it

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