Originally Posted by
m8internet
What speed and load rating are they?
Those tread depth measurements look reasonable
However, if they have been on since 20K miles the fronts should be worn more than the fronts, have you rotated them at any time?
However the rear tyres are wearing more in the middle (if rotated this cannot be investigated)
Equally if you rotate tyres the wear impression remains on that tyre
What tyre pressures you using?
It depends on how you are taking the measurements
It's not easy on the Good Year tyres as the tread footprint is actually wider than profile
It should be 225mm, however it is typically more than this
You then want to take measurements at the central three quarters
This would be intervals of 56.25mm (outer - centre - inner)
The alignment needs to be done within 100 miles of fitting new tyres
As above, if wear commences it will remain, so between May and September that is a lot of irregular wear from incorrect alignment for them to take
Finally, Good Year tyres below 3mm are at the end of their operating life
I do agree though centre wear is unusual, more common is inner wear, normally very noticeable where rear tyres are not rotated
On the front, expect inner or outer wear, here in the UK it is very common due to power steering and the vast amount of high speed corners and roundabouts (or more correctly people driving at a faster speed than they should for such roads)
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