replacing tires on a 4 matic
No, but you need to replace at least two....if you do a front then you need to do the other front !
No. But it is safe to change them by pair: both in front or both in back. I would suggest putting a pair of new in front because of the steering and keep the older better pair for the rear traction. If you live in a cold snowy place you could use 4 good tyres all the time.
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