Pulsating humming noise on smooth road

[Jay1404]

Hi everyone! New to the forum and new to Mercedes cars. Recently bought my cla 19plate 220d and driving home with it on the motorway and smooth roads heard a pulsating humming noise at different speeds that changed when I went faster and slower. Took to dealership which said no abnormal sounds all they can hear is road noise. It came with devanti 18inch on all with 7mm tread all round. Could it be possible to have this kind of noise using a mid range/budget tyre? Anyone else come across this issue?
Thankyou

 

[alexanderfoti]

Yes is probably attribute this to budget tyres.

Especially if I changes characteristics with different road surfaces

 

[Slartibardfast1]

Could it be possible to have this kind of noise using a mid range/budget tyre? Anyone else come across this issue?

When I bought my car (S Class W221) the dealer had put 2 new tyres (budget) on the front. The road noise on a section of the M25 was almost deafening. So loud that I thought I had a flat tyre! I changed these to Michelin Pilot Sport 4 (to match the rears) and when next on the same section of the M25 all sounded normal.

 

[alexanderfoti]

When I bought my car (S Class W221) the dealer had put 2 new tyres (budget) on the front. The road noise on a section of the M25 was almost deafening. So loud that I thought I had a flat tyre! I changed these to Michelin Pilot Sport 4 (to match the rears) and when next on the same section of the M25 all sounded normal.

Chinesium ditchfinders on the front and PS4's on the back are blasphemy!

 

[Slartibardfast1]

Chinesium ditchfinders on the front and PS4's on the back are blasphemy!

The front tyres were advisories on the MOT so the dealer bought cheapest available. I would have preferred he just gave me the £50 towards the PS4's

 

[LostKiwi]

Agree with Alex, almost certainly cheap tyres, especially if the y have a V type tread pattern.

 

[A.J.]

I had the same issue on a VW some years back. Although the tyres had plenty of meat on them I changed them for a new set of Conti's and that cured the mystery

 

[ajlsl600]

Chinesium ditchfinders on the front and PS4's on the back are blasphemy!

Begs question , how do shxte Chinese ryres make it into the UK. 1st World Country (maybe?) relying on safety product from 3rd world manufacturing stds? I use chinesse stuff, only where I envisage a one use only..

 

[JBell]

Begs question , how do shxte Chinese ryres make it into the UK. 1st World Country (maybe?) relying on safety product from 3rd world manufacturing stds? I use chinesse stuff, only where I envisage a one use only..

They write Pirelli on the side wall

 

[JBell]

Relying on safety product from 3rd world manufacturing stds?

All tyres have to adhere to the BS Standards before they are even let into the country

 

[ajlsl600]

All tyres have to adhere to the BS Standards before they are even let into the country

Got that.. std must be shxte from 1920?

 

[ThinkPad]

I have noticed MB are very sensitive to tyres. They love having decent rubber. I would see if a tyre change helps as recommended above.