Change All Four Tires?


#1

I have been told that, with an all-wheel drive car (such as an EVO x or Subaru), if I should, by chance, mess up one tire, I should replace all four tires, rather than only the bad one, or else I can do damage to some part of the drive train by running on uneven tires. Is this true?


#2

Yes. Just look in the owner’s manual. All 4 tires have to be exactly the same diameter.


#3

Its that, or you disable the 4WD system on the Subaru by removing the fuse, and just run the car as FWD.

BC.


#4

Yes, the only other option is to have the new tire ‘shaved’ to the identical diameter, but you’ll want to figure this out (find a place that does it) before the problem comes up.


#5

That is true IF that particular Subaru has a provsion for inserting a fuse in order to enable FWD/disable AWD.

If the vehicle in question has the more advanced Variable Torque Distribution (VTD) AWD system, there is no provision for inserting a fuse for this purpose. While the VTD system is much more resistant to damage than the “regular” Subaru AWD system, it is still a very bad idea to drive more than…let’s say…50-100 miles…on mismatched tires.


#6

The disable AWD only applies to majority of automatic Subaru models. However none manual transmission models you can disable it.

Even disabling, it is considered a temporary measure.

Evo I have no idea.