tire 'cupping' happens very regularly on Volvo V50/S40/C30 and the ford focus.
inside of the tire will wear out a lot quicker due to the large camber of the wheels. If you look straight past the tire you can actually see the incline and the top of the tire is faced inwards. This improves high speed stability and better handling in general.
you can prevent the tires from cupping by selecting the right tire. Some tires are way more prone to cupping than others. I have great results with Dunlop tires.
Furthermore, rotate your tires every 5000 to 7000 miles. Either X pattern or just front and back.
Check tire pressure every month and add around 0.5 bars. I usually drive around with 2.8 bars in the rear (40psi)
Make sure you check the wheel and suspension parts for play, but if they are in okay condition you will probably be fine by taking these items into account.
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