My old OEM Conti's exhibited an odd wear pattern on the feft front only. They were cupping evenly across the tread at a slight angle. The cupping repeated approximately every 5" all around the tire. I had the alignment and balance checked and all was well. Figured it was a bad tire. (tread separation, etc.)

At 35000 I replaced the Contis with some F1 all seasons and after 5000 that same wear pattern is now showing up on the left front again. So it isn't the tire, so what could it be? Alignment checked today is OK, tire pressure and balance both OK, and the wheel is not bent per the alignment shop.

I feel no odd feedback in the steering wheel nor did I ever with the contis, so I am stumped. I am at work, so I can't post a pic, but will when I get home.

Any ideas?