Michelin

Bridgestone.

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Gary is correct. They are Bridgestones. Michelin doesn't really make anything to fit. Make sure the fronts are the Porsche N1.

Pauls, Yes Bridgestone, believe I got last set rears, sold out now, but if you wait they have production run very soon, so get fresh set, have tire dealer check with Bridgestone warehouse directly find out schedule, also make sure Porsche N1 fronts are fresh, had 2015's last I checked.

Bridgestone
RE050A
RE050A Pole Position
265/35-18 Front (92.75) -13.00%
265/40-18 Front (106.00) +0.23%
255/40-18 Front (102.00) -3.54%

RE050A Scuderia
345/35-19 Rear (120.75) -4.17%


Got mine from tire rack not long ago.......all the sizes fits on the stock wheels...




https://www.tirerack.com/tires/Tire...9&rearWidth=255/&rearRatio=40&rearDiameter=17

Uh, davidn, could you decipher your numbers? (92.75) -13.00%
percent of what?

There NUMEROUS threads on replacement tires for the OE Goodyears on our 05-06 GT's.
Believe the settled science points to Bridgestones with the caveat emphasized by fjpikul in his above post.

Indy GT said:

Uh, davidn, could you decipher your numbers? (92.75) -13.00%
percent of what?

There NUMEROUS threads on replacement tires for the OE Goodyears on our 05-06 GT's.
Believe the settled science points to Bridgestones with the caveat emphasized by fjpikul in his above post.

Click to expand...

Yes.....the numbers correlate to deviation from OEM stock goodyear tires.....

-------->Not taking credit for the info.....credit goes to member here "Fubar"

read Width * Sidewall Percentage = Actual Sidewall Height
New Tire Height / OEM Tire Height = Percentage Change

Bridgestone Example:
345 x 0.35 = 120.75mm
126 / 120.75 = (0.9583-1) = -04.17%

OEM:Goodyear
F1 SuperCar
235/45-18 Front (105.75)
315/40-19 Rears (126.00)

Here is the complete list:

OEM:Goodyear
F1 SuperCar
235/45-18 Front (105.75)
315/40-19 Rears (126.00)

Non-OEM: (Sidewall Height) Change from Stock Height

Michelin
Pilot Sport
Pilot Sport Cup
Pilot Sport PS2
Pilot Super Sport
245/40-18 Front ( 98.00) -07.33%
245/35-18 Front ( 85.75) -18.91%
-
345/30-19 Rears (103.50) -17.86%

Bridgestone
RE050A
265/35-18 Front ( 92.75) -12.30%
265/40-18 Front (106.00) +00.24%
255/40-18 Front (102.00) -03.55%
-
345/35-19 Rears (120.75) -04.17%

Hoosier
R6 - A6 - Radial Wet
245/35-18 Front ( 85.75) -18.91% - Wet Only
245/40-18 Front (110.25) +04.26% - All
255/40-18 Front (102.00) -03.55% - R6 Only
275/35-18 Front ( 96.25) -08.98% - All
-
315/40-19 Rears (126.00) +00.00% - R6 Only
325/30-19 Rears ( 97.50) -22.62% - Wet Only
345/30-19 Rears (103.00) -17.86% - R6 & A6

Pirelli
Pirelli PZero
* couldn't find a link for the corsa system
235/40-18 Front ( 94.00) -11.11%
-
345/35-19 Rears (120.75) -04.17%

Kumho
Ecsta XS
265/35-18 Front ( 92.75) -13.00%
-
345/30-19 Rears (103.00) -17.86%

Mickey Thompson
ET Street Radial II
245/40-18 Front ( 98.00) -07.33%
265/40-18 Front (106.00) +00.24%
-
305/35-19 Rears (106.75) -15.28%

Leave it to that Fubar guy.....:facepalm:

Mark, when will we see THE car!

And I think the numbers are incorrect for what is pertinent.

As an example:

OEM Rear Tire: 315/40-19 Diameter is ((315 x .4 x 2)/25.4) + 19 = 28.92"

Scuderia Tire: 345/35-19 Diameter is ((345 x .35 x 2)/25.4) + 19 = 28.51"

Ride height change = 1/2 of diameter difference = 0.205 (less than 1/4 of an inch)

% difference of diameters = 1.4% (speedometer error)

Fubar's calculations fail to include the rather significant inclusion of the diameter of the rim and therefore lead to erroneous conclusions implied about the overall percentage of ride height change. In the "true" calculations above, you can see that the very popular Scuderia rear tire is just over 1% difference from OEM - far from a 4% difference implied in the erroneous calculations.

If you are looking for replacements for everyday driving on stock rims, Bridgestone seems to be the preferred tire.

pauls said:

Why should I ask for Porsche 1 front tires?

Click to expand...

Look back to your first post. See "N1" in the nomenclature?

The front tires are Porsche OEM and the rear tires are Ferrari Enzo OEM.

What's important is that the tread pattern and construction of the fronts and rears match, and they are very close to the OEM Goodyear diameter.

Check the date of manufacture and don't get any that are more than a couple of years old. Newer if you expect to keep the tires for several years.

Bridgestones!

The N1 designation means the tire has an asymmetrical sidewall stiffness. The inner is slightly stiffer (it's a back tire for the 911, with the negative camber and engine weight, the stiffer sidewall helps). The engineer of the suspension told me that this stiffer sidewall will help with a crisper turn in, and would be a better choice over the symmetrical sidewall.

Specracer said:

The N1 designation means the tire has an asymmetrical sidewall stiffness. The inner is slightly stiffer (it's a back tire for the 911, with the negative camber and engine weight, the stiffer sidewall helps). The engineer of the suspension told me that this stiffer sidewall will help with a crisper turn in, and would be a better choice over the symmetrical sidewall.

Click to expand...

Smart guy!
I know your source....:biggrin

Only smarts I have is to ask someone that actually knows something!

Indy GT said:

Smart guy!
I know your source....:biggrin

Click to expand...