Technical Tyre Noise

[Adam1984]

My Panda is parked half on and half off a kerb overnight, every night. When I move off every morning there is a strange noise coming from the tyres that have been resting on the kerb, it sounds like a wobble board sound, any idea what is causing this?

 

[ZaphodB]

How old are the tyres ?

Check the 4 digit date code on each one ( on the side wall)

 

[Adam1984]

I have the brand Davanti all round.

And fronts are: 22 24, and 23 24

Backs are: 23 24 and 21 24.

 

[ZaphodB]

I'd try parking not on the kerb and see if symptoms continue .... does it continue for long?

Could be if the tyre itself is 1/2 on and 1/2 off you're deforming the tyre slightly , because you're halving the contact patch, and it takes a short while for the tyre to get used to full contact again...

 

[Adam1984]

I'd try parking not on the kerb and see if symptoms continue .... does it continue for long?

Could be if the tyre itself is 1/2 on and 1/2 off you're deforming the tyre slightly , because you're halving the contact patch, and it takes a short while for the tyre to get used to full contact again...

No it continues for about a mile down the road and then doesn't exist anymore.

I was thinking could be because they are not balanced correctly? Who knows

 

[ZaphodB]

Balancing problem wouldn't correct itself.

Rubber's obviously a natural product, the 'problem' is I'm guessing as I've mentioned in my previous post.

If the car sits 1/2 on, 1/2 off you're deforming the tyre, and it will take on a memory of that on that contact area, for a little while, which might exhibit as a balance symptom... until the tyre warms up , which is why it goes away..

I wouldn't worry about it, a different brand of tyre might exhibit slightly differently.

 

[ZaphodB]

I wouldn't worry about it, a different brand of tyre might exhibit slightly differently.

...apart from checking your tyre pressures are correct

 

[Panda IIs]

Have a read up on "compression set of elastomers" car tyres are generally made from synthetic rubber (not natural as implied above) but most elastomers have a level of compression set that is influenced by filler content too (which is used to manage wear and fatigue properties). Also as suggested, the tyres take up a set overnight that is removed as the tyre heats and takes a new shape. Also, an aside, the hysteresis of the compound influences the rolling resistance of the tyre, hysteresis is influenced by the fillers, all things are linked and a compromise of individual formulations (road noise another parameter).

 

[ZaphodB]

(synthetic rubber (not natural as implied above)

I was generalising

Modern day car tyres have about 15-20% fresh natural rubber composition.

 

[Peter Pick-Up]

My Panda is parked half on and half off a kerb overnight, every night. When I move off every morning there is a strange noise coming from the tyres that have been resting on the kerb, it sounds like a wobble board sound, any idea what is causing this?

Often, inexpensive, no name tires does this.
Switching to a good brand will solve roadnoise..!!

 

[RalphM]

Could it be something on the curb sticking to the tyre ie different coating leaving a sticky patch on
the tyre were it has rested on the curb.

 

[Peter Pick-Up]

Raise tire pressure...

 

[Pugglt Auld Jock]

Does it do it if you don't park on the pavement? You're lucky to still be able to do this. £100 fine for parking on pavements anywhere in Edinburgh!

 

[timmycm850]

Remember when you arrive the tyres will be road warmed. I estimate a road angle of about 4.5 degrees and this i would estimate gives you 12mm approx compression more on one side of the tyre. Then they cool until you next drive away.

 

[koalar]

Thread is from July

Diagnose, would be far better, does the sound swap sides if they park the other way round

Does the sound swap sides if they swap the tyres over

Does it speed up with road speed, change depending on gear in or engine revs, and so on

If it's engine revs, you can immediately rule out anything that only rotating at road speed

I would think it has very little chance of being the tyres

Might even be fixed by now, water pump. Alternator, aux belt, starter, timing belt have all been changed since then

 

[Adam1984]

Thread is from July

Diagnose, would be far better, does the sound swap sides if they park the other way round

Does the sound swap sides if they swap the tyres over

Does it speed up with road speed, change depending on gear in or engine revs, and so on

If it's engine revs, you can immediately rule out anything that only rotating at road speed

I would think it has very little chance of being the tyres

Might even be fixed by now, water pump. Alternator, aux belt, starter, timing belt have all been changed since then

Hello, and good morning. Yes this has now been solved.

It was the rear shock absorbers Which had failed, with new ones this noise has now gone.

 

[Steveetee55]

Does it do it if you don't park on the pavement? You're lucky to still be able to do this. £100 fine for parking on pavements anywhere in Edinburgh!

Pity they dont do this in Bradford authorities would make a fortune they park where they like round here

 

[Pugglt Auld Jock]

Hello, and good morning. Yes this has now been solved.

It was the rear shock absorbers Which had failed, with new ones this noise has now gone.

Thanks for the update. Always useful to know of a successful resolution.

 

[Pugglt Auld Jock]

Pity they dont do this in Bradford authorities would make a fortune they park where they like round here

It's been largely successful and you don't now often see a vehicle on the pavement. However it's caused quite big problems in some of the older narrow streets where actually there was room for folk to park with two wheels just over the kerb and still leave adequate room for push chairs and disabled folk to pass. Now, because you can't park like this, with all the cars on one side parked against the kerb but not on it, there's not now enough room for cars to park legally on the other side and still leave room for larger vehicles to get down the street. Consequently this has halved the parking available in some areas by half and is a very big problem for some folk.

 

[Steveetee55]

Hello, and good morning. Yes this has now been solved.

It was the rear shock absorbers Which had failed, with new ones this noise has now gone.

Nice to see a problems been resolved