how strange i was about to start a new thread about the same issue I'm having with my st170 only slightly different, i have no humming sound when driving in a straight line at all only when turning in left i get a humming sound from the rear? but it doesn't happen all the time, only on left turns that have a slight gradiant and even then its not every time, i have got 2 sound clips of the sound, the first one you can barely hear the sound at 5 seconds in, and the second one, the faint sound can be heard at 3 seconds in

http://www.mediafire.com/?v3h7v7pilghxvev

http://www.mediafire.com/?56t8om4yx48n8x1

does this sound like a wheel bearing? the sound is driving me bad because i cant pinpoint where its coming from? there is no play in my wheels whats so ever?

cheers for any help guys