Wheel alignment

[Rex Howells]

My mg zs ev, just had a wheel alignment, front good , but was told the back was out, and was non adjustable , and rear wheels are wearing faster than the front.
Has any one else had this problem?

 

[Lovemyev]

Do you have the results / readings from the four wheel alignment ?.

 

[Rex Howells]

Yes , Thankyou.
The front half - toe was
+2.0mm LH
-0.8 mm RH
When adjusted was
+1.1mm LH and
+1.1mm RH
The rear half -toe was
+1.7mm LH
+2.3mm RH
It had a minor adjustment
+1.7 mm LH
+2.1 mm RH
Thankyou for your reply,
Appreciated .

 

[Lovemyev]

So, in order to know IF these figures are within or outside of tolerance, we require the manufacturers specs to compare them with.
We only have toe in figures here ?.
No figures for the camber or KPI so are we to assume that these are all correct to spec then ?.
Both front wheels are reading toe in, okay they needed adjusting of course, but the R/H wheel was not massively out of spec.
But over time, this additional toe in would have accelerated the tyre wear.that was more likely prominent on the outsides edges of the front tyres.
Looking at the new adjusted valves for the front, it may suggest that the manufacturers spec is calling for a very small amount of +toe in value to be applied on the fronts.
Although this value is extremely close to a parallel reading anyway ( which would be my own personal “go to” preference TBH ).
Are the rear tyres displaying any signs of irregular tread pattern wear ?.
Again the figures suggest a + toe in value.
Any noticeable Increased wear on the outside edge of the rear tyres .
Some vehicles do have the ability to adjust the rear geometry, but many of them are fixed.
Any huge discrepancies at the rear can suggest that a wheel has taken a heavy impact, which in turn has bent one of the suspension components.
If the rear set up is fixed, then a heavy impact is the only way it be drastically impacted.
Not that I am suggesting your car has suffered in this way of course.

 

[Rex Howells]

The front tyres didn't appear to have any abnormal wear at all except a minor bit if feathering on the edge if the left tyre, they told me most likely round abouts.
The back right tyre has some wear on the outer edge , left tyre not so much.

 

[Lovemyev]

The slight feathering on the outside edge of the front tyres was caused more by the incorrect amount of extra set toe in, more than the roundabouts I suspect.
This has been hopefully been corrected now of course.
From what I can see reference the rear values, they appear to be in tolerance to me ( unless I am reading it incorrectly ).
Any slight differences can be avoided by carrying out a periodic wheel and tyre rotation.
Switching the front to the rears.
You don’t say if you are a high or low user case ?.

 

[Rex Howells]

Thankyou for advice, it is much appreciated.
Our MG has done 27,000km, and I have found the Michelin tyres very good. The front show little wear, I hadn't noticed the rear was a lot different, except right back looked a little more worn on the outer edge.
The technician is very fussy , some people drive 2 hours for him to do their car's.
He told me, as you have to rotate the tyres. But it's good you think that the back isn't really that far out .

The first photo is the front right,
Second photo the rear.
In the photo, the rear actually seems fine.

 

[Lovemyev]

Of course it’s difficult to really asses the wear pattern from a photo.
I sounds like he had suggested the same advice as myself then.
Maybe rotate the fronts with the backs annually ?.
This will ensure that any minor tread discrepancies are avoided, by leaving the tyres in the same location constantly.
The VAGroup recommend for tyre rotation every 5,000 miles.