Wheel Alignment reading

[zvm77us]

Hi,
I posted in another thread that my front tires (goodyear assurance all-season) are wearing out a little too quick for my taste. So I dug up the Wheel Alignment that I had done when I purchased the tires and am posting the results maybe someone can give me some guidance. The technician said he did his best and its not a big deal hopefully you can shed some light for me if its okay or... Thank you.

 

[gabriel9766]

Well camber is out a bit but it is not adjustable on your vehicle. How is the tire wearing? Inside or outside of the tire are fading across the whole tire? Camer will cause a very little wear on the inside of the tire. Toe is what will kill tires.

If anything u whould have a slight pull right. The vehicle pulls to the highest camber.

 

[bbhero]

Well I've seen a similar report on my Altima when I got my Goodyear Assurance comfort tread tires. These tires have been very good for my car by the way. I am going to buy more in a few months.

Well the camber measurement is how the tire is set vertically on the car. The toe is how the tire is tracking whether it be "in" or "out". Now I could be wrong but negative camber is where the tire's bottom end is kicked out farther than the top end if the tire. This would led to wearing out of inside shoulder of the left front tire on your Jeep. With negative toe out on your left front tire and positive toe in on your right front this would mean that your vehicle would " pull" to the left going doing the road. A simple way to check for problems like this is to drive on a four lane highway in the right lane. If your vehicle pulls across the crowned middle of the road then your vehicle has what your has... Negative toe in left side and positive toe on the right side leading to your vehicle pulling across the crown in the road. My Altima came out just fine in the alignment testing at Goodyear. Now my lady's Sunfire did not. It was pulling from right to left on a crowned four lane highway. So I wasn't surprised that it needed an alignment when I took it there.

 

[kr_bitog]

What is the problem of wear that you do not like ?

Is the tyre wearing at the inner edge of front left tyre or something else ?

Based on the measurement, I do not think the problem is very serious that causes significant wear except you also have problem with the suspension, e.g. strut.

 

[zvm77us]

Originally Posted By: kr_bitog
What is the problem of wear that you do not like ?

Is the tyre wearing at the inner edge of front left tyre or something else ?

Based on the measurement, I do not think the problem is very serious that causes significant wear except you also have problem with the suspension, e.g. strut.

The issue is that I purchased the tired new in August 2015 and put about 1,500 miles on the car and the tire gauge show between 7/32 and 8/32 tread left. Originally it came with 9/32 new. So I think it is wearing a bit prematurely. But the ca only sees New York City driving with tons of stop and go. They are in the front of the jeep and it is a RWD vehicle.

 

[zvm77us]

Also, according to my mechanic he said that the way the wheels were aligned previously caused the death wobble because everything in the suspension looks good and tight. Would the old alignment numbers cause death wobble on the XJ?

 

[gabriel9766]

Originally Posted By: zvm77us
Originally Posted By: kr_bitog
What is the problem of wear that you do not like ?

Is the tyre wearing at the inner edge of front left tyre or something else ?

Based on the measurement, I do not think the problem is very serious that causes significant wear except you also have problem with the suspension, e.g. strut.

The issue is that I purchased the tired new in August 2015 and put about 1,500 miles on the car and the tire gauge show between 7/32 and 8/32 tread left. Originally it came with 9/32 new. So I think it is wearing a bit prematurely. But the ca only sees New York City driving with tons of stop and go. They are in the front of the jeep and it is a RWD vehicle.
the first 25% of the tread of the tire usally wears quicker than the rest of the tire.

 

[Kgrant]

It doesn't look like they did any adjustment on the alignment, perhaps they centered the steering wheel. Those vehicles are notorious for the death wobble, which isn't caused by the alignment. Death wobble can be caused by worn parts and out of round and balance tires. Your new tires fixed the death wobble, not the alignment.

That high of caster and the type of driving your doing will cause the front tires to wear more. I copied the below text from http://www.aligncraft.com/terms/terms.html instead of trying to type it out.

Effects of Caster on Tire Wear

When set with a substantial amount of caster, the spindle travels in a vertical arc, causing it to move up and down and raise and lower the wheels as the steering wheel is turned. Because of this, camber changes occur. With a high amount of positive caster, the camber changes that occur, especially at low speeds in tight turns, cause the tires to show wear on their shoulders. In high speed cornering, the vehicle tends to continue straight ahead when the steering is initially turned. Due to this, and the amount of camber change that takes place when a spindle travels through its arc of travel, the shoulders of the tires on a vehicle may scrub and wear. When a left turn is made at a fairly high rate of speed with a vehicle which has positive caster, the caster of the left front wheel changes toward positive but the momentum of the vehicle is in a straight ahead direction. This causes the inside of the left front tire to scrub as it is turned. Just the opposite effect takes place on the right wheel as the vehicle is turned left at high speed. The right front wheel's camber will go negative but the outside edge of the tire is scrubbed because of the vehicle's momentum to go straight. On some vehicles setting caster more than +2.5° will cause scrub problems.

 

[kr_bitog]

Originally Posted By: zvm77us
Originally Posted By: kr_bitog
What is the problem of wear that you do not like ?

Is the tyre wearing at the inner edge of front left tyre or something else ?

Based on the measurement, I do not think the problem is very serious that causes significant wear except you also have problem with the suspension, e.g. strut.

The issue is that I purchased the tired new in August 2015 and put about 1,500 miles on the car and the tire gauge show between 7/32 and 8/32 tread left. Originally it came with 9/32 new. So I think it is wearing a bit prematurely. But the ca only sees New York City driving with tons of stop and go. They are in the front of the jeep and it is a RWD vehicle.


Most wobble comes from faulty suspension component or tyre, the tyre problem is easy to spot and fix on road-force balancer. For suspension, it is a bit difficult if the car is equipped with lift kit, however it will show on the tread wear pattern whether it is uniform side to side and around the tyre or there is a cupping around.

If the wear is uniformed then you may adjust to have less toe-in to try to address wobble, but if it is not uniformed then another alignment and suspension check may be needed to confirm the root of the problem.

 

[Hokiefyd]

I suspected those Jeeps have a lot of caster, and this confirms that. That much caster will tend to wear the edges of the tread (the shoulder area) as the tires lean over when turned. There's not a whole lot that can be done about that -- that's fixed geometry on the front axle. In theory, one could replace the front control arms with adjustable control arms to rotate the axle forward a bit, to lessen the amount of caster, but that's not something I would recommend (just one of those yes, it's technically possible sort of things).

Your front toe is dead-on. Even before the adjustment, total toe was perfect (the combined total of left and right toe). This still doesn't measure Ackermann in your steering system -- the difference in steering angle between your left and right knuckles. Too much or too little will scrub tires (in addition to the caster here).

Your rear axle may be sitting just a hair crooked -- one side has positive toe (toe in) where the other side has negative toe (toe out). I wouldn't be surprised if the vehicle wanted to drift left just slightly due to the rear axle wanting to always turn the rear of the vehicle to the right. Anything done at the front will have to overcome what's going on in the rear.

 

[ARCOgraphite]

Total toe looks a bit high, prefer to see total at .15-.20 given your caster angle; are the outside 2" wearing faster than the inside 2"? A bit of tierod and idler bushing slop will move that toe to near zero when rolling in RWD.

 

[artificialist]

You can buy special offset ball joints to correct the camber on the LF tire and lower the caster at both front wheels.