i have a sever vibration in the steering wheel at about 50-60mph..its been doing this for a year and through 3 sets of tires. i just got a bran new set of tires and its still there. i cannot track it down. everything inthe suspension seeems tight. ive had many shops look at the car and tell me everything is perfectly normal. aside from just replacing every part in the front end, does anyone have any ideas.

was thinking shocks or wheel bearing. shocks seem ok and not blown out, no leaking. with the wheel bearing theres a lil wiggle but nothing outragous.

help its driving me crazy

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero