High speed humming (long) - Saab 9-3SS Bulletin Board - Saabnet.com
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High speed humming (long)
Posted by Fred93 [Email] (more from Fred93) on Tue, 15 Feb 2011 10:54:38
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My 93 makes a hummimg noise at higher speeds. Both front wheel bearings have been changed by now and the Saab mechanic claims the rear ones are OK. I can notice the humming at 70 mph, it becomes louder at 90 and is really loud above 110. The mechanic's explanation is uneaven thread wear in that the trailing edge of the thread pattern becomes sharper than the leading edge. At higher speeds this then generates a vibration that (especially) the 93 picks up. Has anyone heard of or experienced this? By sliding my hand over the tire I can feel the sharper edges but it is not much.I rotate my wheels back to front but learned by someone to keep the directionality of wheels. My thought was to shift them left to right to wear them more evenly. Thanks for any comments.
Saab 93 Aero, 2004, Hirsch stg 1, Koni FSD, Goodyear F1 asymetric. 120000 miles.
posted by 90.229.196...
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