I spent a fair bit on having all four wheels of my Saab 9-3 Aero adjusted on a proper laser alignment rig earlier this year after changing road springs (originals broken - thanks speed humps and potholes!!).
A month later I kerbed the left wheel but didn't think it significant. Nevertheless I happened to be driving past the depot that did the alignment a few days later so I dropped in and they checked it for me. Sure enogh it needed a minor correction.
So, I would say, go and have it checked. I'm glad I did, what with tyres being circa £130 a corner!!!
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