I get a drumming noise, particularly noticeable on smooth road surfaces, from the rear tyres of my 1999 Vectra. Alternate blocks on the inside of the tyre wear lower and generate the noise. This usually happens after 15K - 20K wear of the tyres. I've had this happen with Michelins, Avons & Continental tyres and is a characteristic of the rear suspension on this model of Vectra.
If you suspect the rear tyres why not have them carefully removed and fit two new ones but take the old ones home with you to be refitted in this proves not to be the problem.
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