[///M TOWN]

Originally Posted by 5.M0NSTER

245/265

Because I push them pas the limits of the car, but the thing is at maintenance (low) throttle, you if all 4 loose it at the same time, that means you have a well balanced chassis. So totally a good thing. This happens in high lateral G situations in the dry, or in fast corners when it's wet, and the limits are much lower.

I have a good friend of mine that's an expert in the tire industry and he tests every single tire as they come to the market and he's warned me not to get away from the stock sizes

[DanG]

Originally Posted by ///M TOWN

I have a good friend of mine that's an expert in the tire industry and he tests every single tire as they come to the market and he's warned me not to get away from the stock sizes

I know that there is enough evidence from the drivers on this forum that the 255/35/19 and 275/35/19 tires are a good alternative to stock sizes and present no problems. I would chose the optional Michelin PS4Ss over the Cup 2s unless you plan to only use the M2 as a track toy.

[///MPhatic]

Originally Posted by DanG

Not sure what your hesitation is with the 255/35/19 and 275/35/19 tire size. They work great on the M2 and are the same size that is standard on the M3/4 with the same stock wheels. It is only 1% larger than stock and does not interfere with any of the cars nannies. Discount Tires even lists it as a standard upgrade on the M2.

Front TW is .2" LESS than the OEM 245/35, and it's .2 taller.
Rear TW is .2" MORE than the OEM 265/35, and it's .3 taller.

Basically when you "upgrade" to this tire you're just adding understeer to the car via additional sideways grip.

I agree that the 255/35 & 275/35 are a decent choice, but I still prefer the stock sizes.

[5.M0NSTER]

Originally Posted by ///M TOWN

I have a good friend of mine that's an expert in the tire industry and he tests every single tire as they come to the market and he's warned me not to get away from the stock sizes

Originally Posted by DanG

I know that there is enough evidence from the drivers on this forum that the 255/35/19 and 275/35/19 tires are a good alternative to stock sizes and present no problems. I would chose the optional Michelin PS4Ss over the Cup 2s unless you plan to only use the M2 as a track toy.

I lead a team of engineers in the auto industry working on chassis dynamics tech. The OE setup is good, but that does not mean you can't increase mechanical grip with other setups.

As long as the camber spec stays similar, wider tires mean more grip. And as long as the ratio stays similar front to rear, balance won't be affected. But you have to keep the camber and toe angles in mind, as well as rim width.

With that said, changing front and rear width by 10mm will certainly not cause any adverse affects, and you will have a bit more grip on both axles.

[GoneIn4Secs]

What about increasing by 20mm?

[DanG]

Originally Posted by GoneIn4Secs

What about increasing by 20mm?

265/35/19s rub in the front with stock suspension.

[///M TOWN]

Originally Posted by 5.M0NSTER

I lead a team of engineers in the auto industry working on chassis dynamics tech. The OE setup is good, but that does not mean you can't increase mechanical grip with other setups.

As long as the camber spec stays similar, wider tires mean more grip. And as long as the ratio stays similar front to rear, balance won't be affected. But you have to keep the camber and toe angles in mind, as well as rim width.

With that said, changing front and rear width by 10mm will certainly not cause any adverse affects, and you will have a bit more grip on both axles.

I'm on stock wheels and I have no plans to change

[DanG]

Originally Posted by ///M TOWN

I'm on stock wheels and I have no plans to change

No problem. I am on stock wheels and suspension also. Remember the M3/M4 wheels are the same stock wheels as ours.

[///M TOWN]

Originally Posted by DanG

No problem. I am on stock wheels and suspension also. Remember the M3/M4 wheels are the same stock wheels as ours.

Yessir

[Davil]

Originally Posted by VisualEcho

Yes, agreed, but the type of tire is the same. You know as well as I do that any Cup2 won't last, it'll get hard and loud quick with any sort of road use compared to a true road tire (they heat cycle out quickly). But again, if you have the money to burn and don't drive much in rain, more power to you .

They are a different design, different construction and have much higher TW rating. They should have been given a different name to prevent all this confusion.

I really like them.

[///M TOWN]

Originally Posted by DanG

Give then a call and see what they say. 206 365-1614.

They called me back

Same info I got

No Dice

[DanG]

Originally Posted by ///M TOWN

They called me back

Same info I got

No Dice

Hmm. Sorry that they gave me different information.

So what have you decided to do?

[///M TOWN]

Originally Posted by DanG

Hmm. Sorry that they gave me different information.

So what have you decided to do?

I think I am going to mount the two fronts and wait until the rears are available

Discount tire never called me back on the Cup 2's anyway

Cup 2's are tempting I'd really prefer the PS4S

Discount has 3 tires 1 rear is unavailable

[Djphonics]

Originally Posted by ///MPhatic

Front TW is .2" LESS than the OEM 245/35, and it's .2 taller.
Rear TW is .2" MORE than the OEM 265/35, and it's .3 taller.

Basically when you "upgrade" to this tire you're just adding understeer to the car via additional sideways grip.

I agree that the 255/35 & 275/35 are a decent choice, but I still prefer the stock sizes.

This tread width makes no sense to me.

A 255 tyre should not be narrower than 245 tyre.

Thats 10mm more it doesn't make sense that its .2" narrower. Yes, I see the chart, but it doesn't make sense with the same tyre model.

[Fugly M3]

Originally Posted by Djphonics

This tread width makes no sense to me.

A 255 tyre should not be narrower than 245 tyre.

Thats 10mm more it doesn't make sense that its .2" narrower. Yes, I see the chart, but it doesn't make sense with the same tyre model.

The Michelin site says 9 inch section width for both with the 245 being on an 8.5 inch rim and the 255 being on a 9 inch rim. Both are PS4S. The 245 was the 93Y non brand specific and the 255 was 96Y non brand specific. Aside from the star rating, I believe those are the correct load/speed ratings for a stock M2/M3/4, respectively.

[DanG]

Originally Posted by F8SEVEN

The Michelin site says 9 inch section width for both with the 245 being on an 8.5 inch rim and the 255 being on a 9 inch rim. Both are PS4S. The 245 was the 93Y non brand specific and the 255 was 96Y non brand specific. Aside from the star rating, I believe those are the correct load/speed ratings for a stock M2/M3/4, respectively.

So the .2 less for the 255 was caused by it being more stretched by being on a 1/2 wider rim. On the same width rim the 255 should be wider.

[medphysdave]

I took a 90 degree turn (1 lane worth of room) at almost 45mph. These tires are ridiculous. Made my butthole pucker, but I thought what the hell.

[///M TOWN]

Originally Posted by medphysdave

I took a 90 degree turn (1 lane worth of room) at almost 45mph. These tires are ridiculous. Made my butthole pucker, but I thought what the hell.

Tire compound is just amazing today with all of the advancements over the years

I remember being amazed w RE71R's back in the day the way you just described the Cup 2's

[Fugly M3]

Originally Posted by DanG

So the .2 less for the 255 was caused by it being more stretched by being on a 1/2 wider rim. On the same width rim the 255 should be wider.

I'd think so, and I can tell you from having an M4 and now an M2C, the narrower tires do look a tad stretched on the rims.

[///M TOWN]

Originally Posted by F8SEVEN

I'd think so, and I can tell you from having an M4 and now an M2C, the narrower tires do look a tad stretched on the rims.

I was interestingly enough just looking at my fronts and they definitely look stretched as well as the back

[///M TOWN]

For M2 track rats
Tech review on the newly transformed
Michelin Pilot Sport Cup 2 (Connect 240)

[Karmic Man]

https://m.tirerack.com/tires/tests/t...y.jsp?ttid=262

Wet grip seems below average in the current crop of Extreme Summer

If don’t care about wet grip then instead of the 4S, might as well go for the A052 or RT660 in stock size which are better in both dry and wet than the Cup 2C