The insides of my front tyres are worn - any idea why?

I own an Jaguar XF 3-litre diesel which is two and a half years old. Both my front tyres still have 4mm of wear left on except for 50mm on the very inside of both wheels, where they're totally bald. The agent says I must have hit a pothole or a kerb but I am confident I have never done either. Is this a common problem, or could the tracking have been out of alignment since the car was new?

Asked on 12 August 2012 by DR, Hawarden

Answered by Honest John
It was probably caused by straddling speed cushions. The chamfered edges abrade the inner shoulders of car tyres, especially on wide, low profile car tyres. But it's also worth having a four way laser alignment at a branch of
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