I'd say it's one of three things then (in ascending order of PITAness)-
1) a nail or screw in the tire. this can be surprisingly loud.
2) brake heat shield
3) bearings

>From: WOGNACIOUS@aol.com
>To: dieselvanagon@hotmail.com
>Subject: Re: Somethings knockin on my wheel........
>Date: Wed, 29 May 2002 20:27:29 EDT
>
>yes, it's definitely coming from the front....

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