NEW TIRES

How are you liking that set?
same sizes I use
Do you have OEM wheels?
Rolled Fenders??


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Did they say when?
Only size in 18 is 245/40
I love my MPSS but I really want to try the new 4S when it is time to change them.



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Hi guys I just wanted to let you all know that Michelin is launching more sizes of the new PS4S in February
The problem is not all the sizes would be available, I requested all the sizes we have discussed here and this is what they told me
“Below are the status on the tire sizes you requested for the New Michelin Pilot Sport 4 S tire.

215/45R18 - Do not make this size -the smallest size in Rim 18inch is 225/40r18
225/45R18 - Launch Feb.1, 2018
225/40R18 - Launch Feb.1, 2018
235/40R18 - Launch Feb.1, 2018
275/40R18 - Do not make this size. We do have a 275/35r18 launching Feb.1, 2018
285/35R18 - Launch Feb.1, 2018
285/40R18 - Do not make this size
295/35R18 - Do not make this size”

So according to an old post of mine we have only these options, remember we have to keep a closer (no more than +/-0.015 in my opinion) diameter ratio between both axles to OEM 0.9610 (25.62/26.66)
And also ideally the rear tire should be bigger than OEM to compensate the speedometer error.
So with all these in consideration the matrix is:

Front
A) 225/40R18 25.09
B) 225/45R18 25.97
C) 235/40R18 25.40

Rear
D) 275/35R18 25.58
E) 285/40R18 26.98

A & D 0.9808 (+0.0198)
A & E 0.9299 (-0.0311)
B & D 1.0152 (+0.0542)
B & E 0.9625 (+0.0015)
C & D 0.9929 (+0.0315)
C & E 0.9414 (-0.0196)

So the winner is
225/45R18 and 285/40R18
And the speedometer error is compensated 1.18%

I am currently have PSS 235/40 and 275/40 (0.9527) and I do not have ABS issues, I did however have a bit of ABS issues (too sensitive) before when I had 235/40 and 285/40 (0.9414) so options A&D and C&E Can have a bit of ABS issues.
Or those two options I prefer C&E in order to compensate the speedometer error vs increasing it.
All the rest are too far from OEM and in my opinion should not be considered.

So the three options are (in order)
1) 225/45 and 285/40
2) 235/40 and 285/40
3) 225/40 and 275/35

(Actually on a personal note my rears PSS 275/40 are almost gone but my fronts 235/40 are still halfway so I most likely will install 285/40 and deal a bit with ABS being a bit sensitive until I need to change the fronts and then install 225/45 to match all 4 with PS4S)

Hope this helps






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Well don’t thank me just yet because I made a mistake, they clearly told me they don’t make 285/40R18 so I need to redo some of the calculations (updating option E) Here they are:

Front
A) 225/40R18 25.09
B) 225/45R18 25.97
C) 235/40R18 25.40

Rear
D) 275/35R18 25.58
E) 285/35R18 25.85 (update)

A & D 0.9808 (+0.0198)
A & E 0.9705 (+0.0095) (update)
B & D 1.0152 (+0.0542)
B & E 1.0046 (+0.0436) (update)
C & D 0.9929 (+0.0315)
C & E 0.9825 (-0.0215) (update)

So the winner is
225/40R18 and 285/35R18
But the speedometer error will increase 3%

I am currently have PSS 235/40 and 275/40 (0.9527) and I do not have ABS issues, I did however have a bit of ABS issues (too sensitive) before when I had 235/40 and 285/40 (0.9414) so options A&D and C&E could have a bit of ABS issues.
All the rest are too far from OEM and in my opinion should not be considered.

So the three options are (in order)
1) 225/40 and 285/35 (update)
2) 225/40 and 275/35 (update)
3) 235/40 and 285/35 (update)

The other three settings are too far from OEM and in my opinion should not be considered

(Actually on a personal note my rears PSS 275/40 are almost gone but my fronts 235/40 are still halfway so I most likely will install 285/35 (update) and deal a bit with ABS being a bit sensitive until I need to change the fronts and then install 225/40 (update) to match all 4 with PS4S)

Hope (now) this helps
I will provide the MSPN (part number) for the tires in a following post (I already requested them to Michelin)








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Thanks actually I don’t think I will have ABS issues using my already halfway worn 235/40 fronts with new 285/35
This because they are 10/32 when new and they will be about 6/32 by that time. 4/32 of an inch per side is 8/32 overall less in diameter or -0.25 inch
So supposedly my fronts would be 25.40-0.25=25.15 and the ratio vs the new rears will be 25.15/25.85=0.9729 making it closer to OEM.

Disclaimer: I am using generic tire sizes for all these calculations, I have no way of knowing the exact diameter of the new PS4S (every tire is different) because those sizes don’t exist yet and they are not published anywhere. But I don’t think the difference would be too much to change the results.



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Ok here are the MSPN numbers for the PS4S sizes we discussed, as I mentioned before I recommend the following setups:
1) 225/40 and 285/35
2) 225/40 and 275/35
3) 235/40 and 285/35
(235/40 MIGHT require rolled fenders and/or a wider front wheel than OEM)


225/40R18 02717
235/40R18 43847
275/35R18 00795
285/35R18 12182


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I am getting combination 1 as well in MP4S, but in the meantime I will get combination 3 with MPSS in the front until I finish those tires.
My rears MPSS are basically gone and I have been waiting for the new tires to be available, funny thing I have always thought almost gone tires would perform better than brand new due to more rubber surface in contact with the road, not the case with this compound, the more wear the tire has the harder the compound becomes and you start losing the tail pretty easy. Even on straight accelerations the car becomes “mustang-ish”


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so to put everything in one post
You can do all the combinations you want as long as the ratio is closer to 0.9610 as possible (no more than 1.5 in my opinion so 0.9610+/-0.0150, and you do not decrease the diameter of the rear tire that much or you will have a bigger speedometer error.
The diameters for all the tires mentioned here are
Front
OEM 215/45 25.62
225/40 25.09
225/45 25.97
235/40 25.40

Rear
OEM 275/40 26.66
275/35 25.58
285/35 25.85
285/40 26.98
295/35 26.12

For example OEM is 25.62/26.66=0.9610

so if you are planning on getting the new Pilot Sport 4S the combinations (in order) would be
1) 225/40R18 and 285/35R18
2) 225/40R18 and 275/35R18
3) 235/40R18 and 285/35R18

if you are planning on getting Pilot Super Sports the combinations (in order) would be
1) 235/40R18 and 275/40R18
2) 225/45R18 and 275/40R18
first combination closer to OEM ratio but might require rolled fenders.

NOTE all these calculations were made with generic tire size diameters, I advise to check manufacturers exact diameter to get a most accurate number, but I do not think it would make a huge difference to change the actual ranking.