Abnormal wearing only on rear tires

It’s normal for rear tires to wear faster at the inside edge of the tread, because of the neg camber on the the rear. It shouldn’t be pronounced, and if you rotate them front-to-rear it’ll even out.

 

The alignment numbers change slightly when you get back in the car. But instead of paying Toyota the $90 and then some to look into it, just pay the tire store in your area the $90 to reset the alignment. The shops around here in my area will do a courtesy inspection to see if it’s possible to do a satisfactory alignment before doing any adjustments.

 

Rear camber is not easily/cheaply adjustable, if that’s the cause.

The title gives me the impression the wheels are not being rotated.

 

Maybe the car has settled on the rear springs, or there is a mechanical issue throwing off the rear camber. Hub assembly’s could be worn out.

 

I found this video on the SPC Alignment website. They actually have a rear toe/camber shim for the Prius. Pretty cool to see the process that iOS followed.

 

I used these SPC shims to fix the rear wheel alignment on my last 2 Prius cars. Both had crap rear alignment from new. Major shortcoming and I hammered Toyota on my last new owner survey. Total crap engineering on a beam axle.

 

Using those shims requires taking off the wheel bearings? It’s almost tempting: just putting a carpenter square against them and doing a little trig, mine seem to have disparate camber, over spec on one side and near the low end on the other. Shimming is something they could have done at the factory?

 

i seem to remember bob wilson doing this.

anyone seen the o/p? seems to be a bit hit and run. maybe explains the salvage title

 

It's a limitation with torsion beam suspension, and the problem is not limited to Toyota - it's a fairly common issue with the 1st gen Nissan Leaf too. Gen 4 Prius has double wishbones on the rear which are adjustable, so it's no longer a problem.