My back tires wear out really quick I just had the entire rear end replaced a year ago had the wheels lined up and the bearings checked, but a set of tires will only last a few months on the rear of the car. The dealer said that nothing is wrong it is just me putting too many km on the ca, the tires only last 10,000 km.
Usually wear in the center of a a tyre is caused by over inflation. Try reducing the pressure by a few PSI ... no more than 5, then monitor the tyre ear.
Manufactures yre pressures are generalised, so the recommended setting may not be correct of your cae
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Re: what cause early tire wear
The Focus' have a bad problem with rear camber. Is it wearing on the inside or the outside of the tire? Not sure if there is a way to fix this as the struts in the rear are not set up for camber adjustments. Make sure you rotate tires every oil change as this will help them last longer. If they are feathering really badly, you have a toe in/out problem which an alignment should help this. Check online for any after market alignment kits for the real as some people like to lower these cars, and there is bound to be a kit for them somewhere.
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Under inflation. When the tire doesn't have enough air pressure, the center tends to be pushed up from the road. Thus causing outer wear on both sides. alignment problems cause wear on one side or the other. Over inflation causes the center of the tire to wear .
if it has independent rear suspension then have the suspension rubbers checked and replace if necessary. Next for all wheel alignments it is essential that the rear end is aligned first to stop this tyre wear before the front wheels are aligned . IF you have leaf springs at the rear check for axle alignment and broken centre bolts or worn rubbers at the centre bolt mounts.
Tire wear as you outlined is caused either by incorrect toe in or camber setting. Both are components of wheel alignment. Regardless of what you were told, there is no other way that happens. As to who gets to pay for it depends on your agreement.
You need to have the front end inspected for damaged steering components. Check your Tie Rod ends, A frame bushings and ball joints to make sure there isn't excessive wear or lose connections. If all of that is in good working order Drive down the road with a friend in the next lane over and have them look to see if either wheel in bouncing. If either wheel is bouncing you need to replace the struts. they are replaced in pairs, both sides. The front end will need to be aligned after you do this.
THese cars have a high speed rated tire and will almost always wear quickly. The right rear is the drive wheel (where the power goes when you give it gas) It will wear real quickly if you drive it hard. I would try rotating every 7500 miles (unless tire sizes are different as with the SL series) I sell a lot of tires on these cars and 25K is usually the limit.
I'm going to bet that you didn't do anything about checking the following:
Tie Rods and ball joints.
Shocks/struts...front and rear
Condition of the tires.
If you don't know how to check the first two, do the following: jack front wheel up and insert a stand. Then take the bottom of the tire and pull up quickly and hard...does it 'click'? Now, do the same from front to back. Up and down wear is ball joints...side to side is tie rods. Get a mechanic to help you. Many chains will inspect for a modest fee.
If a tire is worn because of worn front end parts...the wheel can't hold a proper position in relation to the steering wheel...it wears the tires. They go out of balance and will shake at 25 mph. Check for rounded sidewalls and uneven wear. Replace the tires after getting new front end parts installed and aligned. Check your shocks/struts for excess wear or leaking. They contribute poor ride, to wear and sloppy handling