I need some help with tire wear on my 2013 scion frs
 

This is from my iPhone so if I have any mistakes sorry in advance

I have a 2013 scion frs. My rear tires have been wearing out very fast. The car is fully stock except for an exhaust and aftermarket str rims staggered and concave I think that's what it's called the rear tires are a little bit stretched. I don't have any other mods no camber kits fully stock suspension. My new tires in the rear have 3k miles on them and the inside of the tire is almost gone. I had these tires for about 10 weeks and I don't understand why they are getting used up so quick I had alignment done when I bought the rims and tires 10 weeks ago and after 2k miles I rechecked my alignment and tire pressure. The alignment is all good and my tires are at 40psi. Only the inside of the tire is getting used the outside is perfect and the front is like brand new but the inside of the rear tires are really low. What else could be causing my tires to use up so quickly. I have drifted it like 5 times in really rainy conditions and I don't think I could have used so much tires in 5 different drift times..
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I don't know we're to post this so any help will be grateful. This is my second car and I worked really hard to get it but I keep having these problems and I don't know what could be causing them.

first of all, pics of tire? Off car if possible?

Wheel and tire specs?

Did you change the weight of the car in any way? That really sounds like an alignment issue

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Toe?

I can't get the pictures today. The frs is getting new springs today. It's at the shop and tonight I'm picking it up. I will upload as soon as possible the tire specs and the rim picture. But it will probably be on the car. Thanks for the help! I really appreciate it.

Thanks for the help!
 

I didn't change anything other than exhaust and rims. I do some beginner drifts that are just by overpowering. And it's really hard to do nice drifts with staggered rims. I checked my alignment and it always comes up good. And I don't know what could be causing it to wear that fast. So I went to the forum that for my car.

when you post photos post wheel size info too (like the offsets) and do you have spacers on too? the more info you give us the better we can help.
I had/have stagger set up as well. There is a natural camber in rear anyway but my tire ware was always pretty even. I'm curious about whats going on there.

How are you checking the alignment? I'm not familiar with any way of doing this that doesn't involve some fairly sophisticated machinery. That would be found in an alignment shop.

I'd suggest you have the alignment checked at a different alignment shop.


humfrz

40 psi is 15% too high and with stretched tires I would expect excess inner wear with just the stock camber. Ya wanna play ya gotta pay....

Your problem right there.

-alex

+1 ntron1 suggestion, the reccomended cold psi is 35 or so.....

So you have excess wear in the inside rear yet are lowing the car and increasing rear camber as a result while you still dont know the cause (though a few people have given some good info).

You say the alignment is fine, what are the specs? Are you getting a new alignment post spring install?

As I said before I rarely drift ever since I got new rims and tires I drifted about 5 times. And I couldn't have wasted that much tread in those five times no matte what I do. And it was in really rainy conditions.