[postdady]

I am at about 8k miles and my tires are ready to be replaced.

I would like to change to Michelin Pilot Sport 4S (new version of Pilot Super Sport)

They dont make Michelins the same size as the OEM tires. So this is a good reason to get new wheels.

Does anyone have any recommendations on size and type of wheel I should look to get?

[Ghetto2315]

Subscribed.

If you stick with your OEM wheels, let me know with what tire size you go with.

I am looking to get a new set of tires using my OEM wheels and just go a tad bit wider

[postdady]

Does anyone know with certainty what size tires can fit on the OEM wheels?

[SteveB_UK]

Originally Posted by postdady

Does anyone know with certainty what size tires can fit on the OEM wheels?

I was researching last night to post to the mother active tyre thread.

I would expect to be able to go up 20mm on width and drop 5% on profile front and rear. This will keep the diam of the tyres almost the same. And shouldn't have issues with fouling against inner wheel arches, etc.

But the sizes are hard to find. And where I did with Conti, for those sizes 235/40/20 and 265/35/20, our rims aren't wide enough for their recommended rim width range.

I bet they would still fit and be ok, but you may have insurance implications if an insurance assessor inspected an accident and found wrong tyres fitted that weren't recommended for the wheel size....

Closest I've found that fit within the recommended width specs are Mich Pilot Super Sports but these aren't ideal as smaller in diameter 225/35/20 and 255/35/20. They will give the car rake, dropping it 18mm at the front and 9mm at the rear and may make the arches look wrong unless you also fit lowering springs.

I have to carry on researching with other tyre brands but have had recent excellent experience on different cars with the Mich and Conti so started with those.

[Ghetto2315]

Originally Posted by SteveB_UK

Closest I've found that fit within the recommended width specs are Mich Pilot Super Sports but these aren't ideal as smaller in diameter 225/35/20 and 255/35/20. They will give the car rake, dropping it 18mm at the front and 9mm at the rear and may make the arches look wrong unless you also fit lowering springs.

I have to carry on researching with other tyre brands but have had recent excellent experience on different cars with the Mich and Conti so started with those.

What do you mean they aren't ideal as smaller in diameter 225/35/20 and 255/35/20?

The 225 front and the 255 rear would be wider than OEM...

[SteveB_UK]

Originally Posted by Ghetto2315

What do you mean they aren't ideal as smaller in diameter 225/35/20 and 255/35/20?

The 225 front and the 255 rear would be wider than OEM...

They will have a harsher ride, will lower the front significantly and change the aero as will give rake. And will that aero change be good or bad?

And I suspect they will make the wheels/tyres look smaller = sh1t!!!

Wider isn't always better.

[Ghetto2315]

Originally Posted by SteveB_UK

They will have a harsher ride, will lower the front significantly and change the aero as will give rake. And will that aero change be good or bad?

And I suspect they will make the wheels/tyres look smaller = sh1t!!!

Wider isn't always better.

True wider isn't always better but the biggest complaint of performance oriented i8 drivers are the skinny tires which give up too quickly because they are not wide enough. To a degree, I would give up some comfort for a better handling i8

[SlipperyGary]

Pilot Super Sports come in 245/40R20 and 285/35R20. The 245/40R20's are OEM size and the 285/35R20's are essentially the same diameter (-0.7% difference). If I were to make a change that's what I would do.

[NGR]

Originally Posted by SlipperyGary

Pilot Super Sports come in 245/40R20 and 285/35R20. The 245/40R20's are OEM size and the 285/35R20's are essentially the same diameter (-0.7% difference). If I were to make a change that's what I would do.

But....would the 285s fit on the existing rims (in terms of width)? Anyone definitely got these installed?

[SteveB_UK]

Originally Posted by NGR

But....would the 285s fit on the existing rims (in terms of width)? Anyone definitely got these installed?

That is my concern. Both from a performance and insurance point of view.

The data for these tyres from Michelin doesn't recommend the stock rim sizes. Even 20mm wider is a no go according to their spec sheets. But I'd risk that personally.

And if the tyre is too wide for the rim any benefit you may get is lost because the tyre isn't designed for such a narrow rim.