Tread is wearing off on one edge of rear tire?

It is an alignment issue. That or the tires on the other side of the truck are smaller diameter.

Generally if the tires arent the same diameter across the axle, the trucks differential will have to work harder.

 

Looks like it is cupping on that edge at the same time.
Could be a loose wheel bearing on that wheel.

 

what happen to the rest of the tire. i only see one groove

 

Shocks.

Replace all of them then get an all axle alignment.

 

From the looks of it you are due for a tire.

 

Well it could be all thats been mentioned. Does it do that on previous tires in that position? Doesn't look like a shame to the tire, its wore out anyway. Like mayby that wear pattern may have started on a different position somewhere? Do you keep track of miles on tires? Personally i would put new ones on. Probably both sides, to keep things straight. (If whoever owns the truck had the money. )I have steer tires wear stupid and all i did was changed brands and wear was perfect. Also check their psi at regular intervals. Not say'in you don't.

 

Wow! The brilliant advise we get in this forum!

 

Check out page 124 on the PDF, which I highly recommend you keep a copy of.

http://www.euroratas.lt/galery/_eur...cija/radial_tire_conditins_analysis_guide.pdf

That document will help you a lot when trying to troubleshoot tire issues.