'11 Mondeo rough ride around 30mph

Has it got a spare wheel?

If so, rotate that around the four corners, taking one tyre out at a time, and see if that makes it go away. If so, that tyre's deforming.

Liking that idea...

Is it just a noise, or a vibration and noise?

Does it change if you apply the brakes?

Just a noise comes in at around 25-30, gone at 50, It can increase in volume under braking, especially on smooth tarmac. Due to the s***ty traffic I commute in, getting it above 30 to analyze it doesn't happen much. Computer has 15mph average at present.

Duh, make that 45 miles ...

First guess would be a wheel bearing. But it isn't always easy to know which one.

I've had this sort of thing on Vauxhalls, and the local garage says its the way the tyres wear. The ones originally fitted by Vauxhall wear in the shape of 50p pieces and produce a noise exactly like a worn wheel bearing.

Perhaps this is to encourage their tyre sales!

Is it worse if you are turning one way or the other?

If it's a wheel bearing, generally the noise gets louder when you turn the opposite way to the dodgy bearing and the load on the bearing increases.

Chris

The front tyres are quite worn, O/S is almost on the TWI, N/S has about 1mm more. I may swap the rears over.

It's really time to change the tyres then. Anything below about 3mm means less grip in the winter weather.

Chris

I'm on that. Done the first wheel replacement still go that vibration, will do the others. I'll get back on to the dealer after the new tyres are on & I still have the noise.

Pending me getting a couple of tyres next week (happy for any recommendations on brand)I swapped the almost new rears to the front & vice versa. The noise is now definately behind me when it was in front before. Seems I have it nailed down to a specific wheel. The ride is a lot better with fresh rubber at the front too.