Tire Concerns: Replacing Flat tire
On my 2000 ML320 Mercedes I have a flat tire (rear) that needs to be replaced. Do I need to replace both rear tires, or at what tread depth difference do I need to do that, or do I need to repace all 4?
Usually the only time that you may find it necessary to replace all 4 tires on a vehicle because one is no longer useful is when you are driving a 4WD vehicle and the other tires are all nearly worn out.
4WD vehicles need to have have all wheels almost the same size (no more that 1/2" difference between them) in order for the differential to work properly and if just one tire is out of the tolerated range serious mechanical damage can result.
Where you have two tires on a vehicle with simple traction that are widely different in wear, it would be a good practice to replace both tires on the same axle, at least and, if you wish to still get some further use from the other tire, relegate it to be used as a spare tire.
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