Michelin Pilot Sport 4S 295 30 21,anyone fitted ?

[brab]

The depth of a tyre , in this case 30, is a percentage of the width. As the wheel size is fixed, if you increase the width and keep the depth % the same, you have a bigger rolling radius. If the radius is bigger, then the circumference will be bigger too, so the tyre will travel further for each revolution of the wheel, ie it will indicate slightly lower speed on the speedo.

Hope that helps! There is a website somewhere which will give you the direct comparison between different tyre sizes.

Dave

Rolling circumference is 20mm bigger with 295 tyre - due to deeper tyre wall (30% of 295 rather than 30% of 285) meaning the speedo will read 0.84% less at same speed. Tiny difference.

Ah ok, never really looked into it in depth, but always thought the profile number was fixed instead of it being basically an "aspect ratio".
After that it's obviously clear that the distance covered 295 vs 285 is greater with each rotation.

You learn something new every day, thanks!

[Markp]

There is a world of difference between the MPSS and 4S - I ran both on my C5 and the $s was soooo much better!

Bite the bullet and get some - you won't regret it!

As much as I’d like to fit the MPS4S in 295 flavour I don’t think it’d work with my set up so stayed safe with the MPSS in 285



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Main difference for me was sidewall - MPSS v stiff over road imperfections.

[uplandsway]

Hi
I’ve not risked it as I don’t run spacers due to wheel offsets 21x10.5 et25 so have played it safe with MPSS 285 30 21


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How do you find them? Fed of of the conti's so v tempted.

MPSS fitted Friday.

The tyre change has transformed the car, loads more grip and feels sure footed.

Take care


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