I think i put this in the wrong place so i am reposting it.

I have a cut in the sidewall of my passenger side rear tire. I would rather not relive the stupidity as to how this happened. Suffice it to say that I had my head somewhere it should not be when driving.

So on to my question. I know and AWD car is picky about tire sizes being the same. My question is this: How much tire wear on the three good tires is enough to cause issues with this.

Next question: How do i measure tread depth other than with an actual gauge of some sort.

Thanks in advance.

 

rule of thumb is you shouldn't have more than 3/32 difference between tires, so pretty much if you only have like around 5 thousand miles on your tires you should be ok but other than that you should probably replace all of them

 

About 17k so Four tires it is YAY!!!
Thanks for the information.

 

^^^ Fvck that, jus replace two at most and put the new ones in the back, then rotate them to the front when the older two get crappy. There are wear bars you can tell the tire life by too, or one of those specialty tools called a RULER lol. FYI if awd systems were really that sensitive to size differences, then they would all come with full size spares...

 

What about the spare?? That's also a full sized tire - right? (on an AWD).

 

Yeah idk, like faster said the spare isnt full size. I had the same thing happen, and just tried to keep them similar tread on each side.. I never had a problem. Obviously you dont want to screw up the diff or something but nothing happened to me, 4 new tires isnt so cheap either especially if the other 3 arent in bad shape. I just got new tires at about 150,000 and i probably drove on the older ones for a solid 10,000, do at your own risk but I was fine.

 

Replacing two should be okay.

 

I asked a similar question not too long ago. You can even have two different brands of tires, just as long as the tread life is close and the tire size itself is the same...

 

I know they dont come with full size spares but I think the actual diameter matches.
Specialty tool called a ruler. Funny guy there. Thanks for the info. May just look into getting two.

Thanks for everyones opinion. Just didnt want to go by the tire guy he naturally thinks four new tires is the way to go LOL.

 

yeah i would say two would be fine. I trashed a tire/wheel on a pothole a while ago, replaced two and rotated them and have been fine for about 10k miles so far. *knocks on wood*