Do you change all four of your tires?

RustyRatRod said

Tires are replaced in pairs or sets of four UNLESS you have an AWD vehicle that utilizes a viscous coupling connecting the front and rear drive axles together. Because if this, it is imperative all four tires are as close to the exact same diameter as possible, otherwise, the drive axles will turn at slightly different speeds and burn the coupling up. I assume we're not talking about AWD, though. lol So in pairs or sets of four is correct.

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What he said.

Many cars now are AWD or have some kind of differential in the driveline. Plus all the traction control stuff.

Needless to say if it’s a modern shop servicing mostly modern cars there are a lot of vehicles out there that can’t have a single tire, or even a pair of tires changed out anymore.

And I’m sure they all deal with plenty of people that don’t know crap about their own cars and argue about needing all 4 when they in fact do need all 4.