Just had my tracking done at a local Ford dealer and they spotted serious wear on the inside of each rear tyre.

I hadn't noticed it before, as there's a good 4-5mm of tread left across the rest of each tyre.

I doubt it will pass its MOT (due in January) with wear like that (it feels almost perfectly bald/smooth), so in addition to a new set of rear tyres, what other settings need checking to avoid uneven wear like this again in the future?

 

What where the values (ie camber., tracking) of the 4 wheels when they measured it up?

 

Rear camber is the most likely cause, and I believe that you must shim the half shafts to change camber on these cars.

Although probably not directly caused by them, the wear may have been enhanced by the spacers you fitted, as it will alter the loading of the tire somewhat.

 

Do you have lowering springs installed?

 

camber greater than a -1.5 or more than likely insufficient rear toe in(too much toe out)
spacers and lowering will make the camber mroe negtive when lowering, and moving the contact patch out will meen that the same camber on 1 car will be more of an issue on yours because youve slightly increased the leverage in the suspension. If both rear eccentrics to set toe in the rear are pointed straight at theeach othe(center of car) that the max adjustment avail. If youre not there with that type tire wear you need to be

 

I hadn't thought the 15mm spacers would cause such a problem I haven't lowered the car or touched any other part of the suspension.