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Michelin Pilot Sport 4S :: 996 warning

aero996

aero996

Trainee
Joined
22 Apr 2024
Messages
95
These tyres hum/resonate at 40mph and 70mph. It’s really really bad. Ive done 400miles hoping it will settle.

My alignment and corner weighting is spot-on following a full day session at centre gravity this month. All bushes and suspension are new.

My wheels are standard in 18x8 and 18x10 without spacers.

Tyres sizes are 224/45r18 and 285/30r18

Pressures are OEM

Fronts are date stamped 1month old and rears are 13months old - bought new from Camskill.

Camskill say this is because they are not N-rated… which I can’t believe would result in this!?

The rear tyres are extremely wide… 30mm wider compared to the PS2 they replaced… see below.

Anyone else experienced this?
 

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I've got non-N rated 4S on my 997 and they don't hum at all, but I do have experience with semi-slicks which make a lot of noise.
 
Perhaps 19s are better? I’ve also run plenty of track tyres and can adjust to noise but it’s the speed related humming that I’m not used to… especially on a road tyre.
 
I'm probably grasping at straws here, but do you think it might be something to do with road surfaces?

When we switch countries, the difference in tyre noise from the different types of tarmac can be startling.
 
The non N rated thing is nonsense. But I’m stumped as to why they’d resonate at these speeds, I’ve never heard this about any Michelin tyres before, let alone ones as popular as PS4S (which can you now get in 18” size? You didn’t used to be able to).
 
MaxA said:
I'm probably grasping at straws here, but do you think it might be something to do with road surfaces?

When we switch countries, the difference in tyre noise from the different types of tarmac can be startling.
Click to expand...
I appreciate the theorising (sincerely) but I don’t think so as it happens at 40mph and 70mph on all road types. It never happened on the old PS2s.
 
ChatGPT suggests the following (I’m hoping it’s a breakin thing and more miles will resolve)

Brand-new car tires can hum on due to several factors, including:


1. Tread Pattern – Some tires, especially those with aggressive or asymmetrical tread designs, generate more noise as air gets trapped and released between the grooves.


2. Break-in Period – New tires need a break-in period (usually around 500 miles) for the tread surface to wear slightly and settle into normal operation. Until then, they may produce more noise.


3. Tire Compound – The rubber used in new tires may still be stiff, contributing to increased road noise until they soften with use.


4. Wheel Alignment Issues – If your car’s wheel alignment is slightly off, the tires might wear unevenly or make more noise due to improper contact with the road.


5. Tire Balancing Issues – Improper balancing can cause vibrations that lead to humming or droning noises at high speeds.


6. Road Surface – Some motorway surfaces, especially concrete or grooved asphalt, can amplify tire noise.


7. Air Pressure – Incorrect tire pressure (too high or too low) can cause uneven contact with the road, leading to increased noise.


8. Wheel Bearings or Suspension Issues – Though less likely with a new car, failing wheel bearings or worn suspension components can create a humming sound that might seem like tire noise.

If the humming persists beyond the break-in period or becomes louder, it may be worth checking with a mechanic or tire specialist.
 
I had nothing like this when I ran them on mine and I'm now using ps5 with no issues. gave CG a call and ask them if ever heard of it. given how many of us have ran ps4s tyres over the years if this was a issue with every set some one would have stated it sooner you would hope.

edit just to note that the 4s are a louder tyre due to the stiffer side wall. not as bad as cup 2 but more road noise in general
 
On the plus side they look better on the wheel than the slightly stretched look of the PS2
 
What's wrong with OEM tyre pressures?

Letting them down over 10% will result in poorer handling IMHO.
 
scottos said:
Oem tyre pressures are terrible as well, try 32 front, 36 rear, hopefully they just wear in as it sounds very odd!
Click to expand...
agreed i run 32 front 36 rear myself
 
I drop pressure on my turbo - standard is far too hard.

OP please keep us updated on this. Many folks are running those tyres and you're the first I've seen mention this problem. Any chance your fitter had a bad day and got the balancing wrong? That would be the first thing I would check (and cheap to do so).
 
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