Noisy Ford Mondeo - what's the cause?

My 2008 Ford Mondeo is making a humming noise at the back. The frequency of the noise increases with speed. Tyres are Goodyear 215/55 R16s. Is this road noise or something more serious?

Asked on 13 December 2013 by podonahue

Answered by Honest John
Might be the tyres. Might be wheel bearings. If the tyres are below 4mm, then probably the tyres.
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