Rotational noise caused by different tyres on axle?

[pscl227]

Hi,

Having a slight issues with a rotational noise above 55mph, which seems to get worse as the speed increases, the car is RWD and it would appear to be coming from the front.

I have had it into the garage to be looked at under warrenty, and although they can hear the noise they can't locate it (despite trying for 2 weeks....apprently)

I spotted today that the two front tyres although both P Zero Rosso one is 255/40 R 19 and the other is 255/40 ZR 19, one also seems a lot more worn than the other, and the tread patterns are completely different. Do we think this could be a source of the noise, is it worth a £460 gamble to change them both?

If I had noticed this before I bought it, I would have insisted they were both the same, but it is too late now!!

Cheers,

P

[Captain Muppet]

If the rear tyres are the same size just swap front and rear wheels and see if ther noise moves.

If the rear tyres are bigger see if they'll fit on the front for a short diagnostic drive.

[pscl227]

Captain Muppet said:

If the rear tyres are the same size just swap front and rear wheels and see if ther noise moves.

If the rear tyres are bigger see if they'll fit on the front for a short diagnostic drive.

Unfortunately the rears are a fair bit bigger 285/35/19, otherwise I would have already given this a go. The size combined with the 1 mile long twisty pot holed drive way I have would be a bad idea.

[Captain Muppet]

The rolling radius is the same, give or take 2.25mm. It's only an extra 30mm of width, so they might fit on the front, depending on offset.

Worth a try if the alternative is a £460 bill.

I'm assuming here you don't have a spare wheel, and the garage don't have any spares you could use for diagnosis. What car is it? Some helpful PHer might have some summer wheels they could lend you for half an hour.