Unusual rear tire inside wear on 2007 prius

Which is it? If the tires are wearing more on the inside, how can the tires be wearing evenly? A woman can't be a little pregnant now can she?

Toyota lists the rear alignment as non adjustable. Their only correction is to replace the rear beam. Better alignment shops can apply shims.

EDIT: Assumption of rear beam not being bent.

Alignment will only correct uneven tire wear.

Bumpiness can be due to suspension or tire issue. Assuming you/shop followed correct repair procedures, all wear items were replaced on the front strut: Strut, bearing mount, upper & lower spring insulator, oil seal, bumper (optional). All bolts tightened correctly? Spring not broken?

Rear shock: the shock, shock absorber cushion, upper coil spring insulator. All bolts tightened correctly? Spring not broken?

Other suspension components inspected? bushings, tie rods, ball joints, control arms.

Tires? You say heavily worn. Legal tread limit is 2/32 inch. If below, replace. Since tire is heavily worn, tread itself may have a bump that is protruding, coming into contact with the road, which you feel. You can lift the car and inspect all four tires to see if tread does have a bump. If so, replace immediately for everyone safety.

 

It’s really hard to tell from the picture how much more they are on the inside than outside. If inside wears significantly more than outside on both rear tires you probably have rear tow out. Only one tire needs to be wrong since effect will be the same on both (car will just travel a bit sideways). To fix the problem you need to replace the rear axle or use shims.

 

how many miles on them?

 

Unless you live in Utah or some such, I think you meant "my wife's Prius". (Sorry, could not resist. )

To me, those tires look severely over inflated. Do not inflate to more that 39 PSI on the rears. Any more than that will get you insignificant fuel savings. Lower pressure may help with the ride quality, but is not the cause of your tire wear.

+1 to what Valde3 said, you should listen to him.

 

Tires wear tells it all. Looks like Under inflation, negative camber, toe out, worn shocks, excess suspension free play/ wheel/tire runout, Looks like cheap tires too! Take it to a reliable shop for full inspection from a well season mechanic!