Hi I recently bought a 2009 Fiesta tdci zetec s. It's got the original 17 inch alloys with low profile tyres, (not makes I recognise). It drives lovely but has this annoying humming sound, (sounds more dramatic on smoother road surfaces and higher speed and at very low speed). I took it back to the garage where I bought it from and they had it for nearly a week looking at and testing various things to find the problem. They came back saying that it's the low profile tyres and because they are a cheap make. They went on to say that they tried another set of wheels and it didn't make the noise. So when I purchase new tyres I should get a better make. Just wondering if anyone else has had the same problem?? It's under warranty for a year from mechanical faults and only 3 months with all other things.