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      10-29-2020, 12:58 PM   #221
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Quote:
Originally Posted by VisualEcho View Post
Your 255/275 combo is indeed giving you a slight amount more sideways grip, as well as giving you slightly more understeer, slower turn-in, less grip in the rain compared to stock sizes, and slightly less power because the weight is further away from the hub.

Everything is a trade off, and to that end the 245/265 combo is the best trade-off for most, which is why BMW spec'd them.
This is a good discussion. Why does the M3 and M4 have 255/275's installed as standard. Do you think the cars weight is a factor? My guess was that BMW did not want the M2 to out perform the M3 or M4.

I switched to a 255/275 set up on my 17M2 using PS4's and felt like the car handled better not to mention the tires filled the arches better. I have PSS installed on my 21M2C and and plan to switch to PS4 at the first opportunity. I felt more confident on the larger tires.
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      10-29-2020, 05:00 PM   #222
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Quote:
Originally Posted by kvndvs View Post
This is a good discussion. Why does the M3 and M4 have 255/275's installed as standard. Do you think the cars weight is a factor? My guess was that BMW did not want the M2 to out perform the M3 or M4.

I switched to a 255/275 set up on my 17M2 using PS4's and felt like the car handled better not to mention the tires filled the arches better. I have PSS installed on my 21M2C and and plan to switch to PS4 at the first opportunity. I felt more confident on the larger tires.
I'm betting it's because it's a larger car, but you'd really have to ask BMW that question.

And yes, the PS4S will give you better performance no question, it's a much newer design tire.
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      11-21-2020, 12:07 AM   #223
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Quote:
Originally Posted by CSBM5 View Post
kart driver

Note that there are currently 5 different Cup2s in the stock front size (245/35-19) and 7 different Cup2s in the stock rear size (265/35-19). Two of the front sizes are homologated for BMW motorsport and Tirerack calls out one of those as "Star BMW M2". There has just been a 2nd BMW * tire released notated as "BMW * DT1".

Similarly in the rear there are now three Cup2s that are BMW *, the original plus DT and DT1 versions.

The USA Michelin site isn't useful to view all of these, and since you're in the EU, you can view the sizes and versions on the UK site or pick the site for Germany - they have the same listings.

More than likely these are all similar enough that mixability (front to rear compatibility in terms of peak grip and in terms of transient response, i.e. slip angle versus grip force) would not be an issue. However, it wouldn't hurt to match the front and rear versions. I would tend to stay away from the MO (Mercedes) and N0 (Porsche) specific versions.
Cup 2 tires

245/35/19
BMW* = M2
BMW* DT1 = M2CS

265/35/19
BMW* = M4GTS
BMW* DT = M2
BMW* DT1 = M2CS

DT1 = new sidewall design and tread wear 240
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      11-21-2020, 12:11 AM   #224
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Quote:
Originally Posted by VisualEcho View Post
Because no 265/30 exists in that tire.
For the rear they used the BMW* PSS from the ZCP M3/4. For the front there is no BMW* PSS in 265/35/19 as the ZCP runs 20s all around. That's why they subbed it in with the 255/35/19 from the regular M3/4.

Last edited by M4_GTS; 11-21-2020 at 12:17 AM..
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      11-21-2020, 09:19 AM   #225
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Quote:
Originally Posted by M4_GTS View Post
For the rear they used the BMW* PSS from the ZCP M3/4. For the front there is no BMW* PSS in 265/35/19 as the ZCP runs 20s all around. That's why they subbed it in with the 255/35/19 from the regular M3/4.
Again, they used a 255/35 because the correct size of 265/30 wasn't available in the PSS.
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      11-21-2020, 07:54 PM   #226
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Quote:
Originally Posted by VisualEcho View Post
Again, they used a 255/35 because the correct size of 265/30 wasn't available in the PSS.
Again, the correct size would be 265/35/19 and not 265/30/19 for the M3/4 CS. The rolling diameter of a 265/30/19 front and 285/30/20 rear is way off. Please see below to get an understanding of how tire sizes works.

M3/4
255/35/19 (661mm)
275/35/19 (675mm)
14mm 2% difference

M3/4 ZCP
265/30/20 (dia 667mm)
285/30/20 (dia 679mm)
12mm 2% difference

M4 GTS and CS (Cup 2)
265/35/19 (dia 668mm)
285/30/20 (dia 679mm)
11mm 2% difference

M3/4 CS
255/35/19 (dia 661mm)
285/30/20 (dia 679mm)
18mm 3% difference

265/30/19 (642mm) will be 37mm 6% different than 285/30/20. This combo will not work and there is no reason for BMW to select this combo.
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      11-21-2020, 09:02 PM   #227
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Quote:
Originally Posted by M4_GTS View Post
Again, the correct size would be 265/35/19 and not 265/30/19 for the M3/4 CS. The rolling diameter of a 265/30/19 front and 285/30/20 rear is way off. Please see below to get an understanding of how tire sizes works..
The correct size for the M2 would be 265/30 & 285/30.

Put your calculator down and go check the actual tread-widths and OD's.

And regardless, this discussion isn't about an M3/M4 CS, so I really don't care what they wore or wear.
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      11-22-2020, 10:54 AM   #228
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Quote:
Originally Posted by VisualEcho View Post
The correct size for the M2 would be 265/30 & 285/30.

Put your calculator down and go check the actual tread-widths and OD's.

And regardless, this discussion isn't about an M3/M4 CS, so I really don't care what they wore or wear.
Do you have any track time with these sizes I would love to run these w/o rubbing. Need to change tire for next season. My concerns are also around section width. I don’t like scraping off fender paint lol.
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      11-22-2020, 12:12 PM   #229
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Quote:
Originally Posted by VisualEcho View Post
The correct size for the M2 would be 265/30 & 285/30.

Put your calculator down and go check the actual tread-widths and OD's.

And regardless, this discussion isn't about an M3/M4 CS, so I really don't care what they wore or wear.

Ok there, I must be seeing things here. Have yourself a great weekend.
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      12-05-2020, 07:57 AM   #230
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I finally swapped my stock contis for PS4S and increased the size to 255/35 and 275/35.

In my OG M2 with stock map, the contis could barely hold on in a straight line. Stage 2 it had no chance, and in the wet it was very nervous.

The PS4S have been great so far - can hammer the throttle and it just goes. Will be interesting to see how it goes when I reflash stage 2, and also in the wet.

Question - does anyone run coilovers and spacers with these sizes? I was running 12/10mm spacers but the rear rubbed occasionally. I did notice that the new tires poked a bit, as compared to the flush look of the originals. I've removed the spacers for now, but do feel they could be pushed out a little!
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      12-05-2020, 06:12 PM   #231
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Can someone confirm if the upsize of 255/275 on mps4s with 12f/10r spacers work w/o any rubbing on stock suspension on a LCI M2?

Thank you in advance! =)
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      12-05-2020, 06:39 PM   #232
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Quote:
Originally Posted by jello View Post
Can someone confirm if the upsize of 255/275 on mps4s with 12f/10r spacers work w/o any rubbing on stock suspension on a LCI M2?

Thank you in advance! =)
Not sure about the rub, as that has to do with how hard you hit dips, but you'll poke for sure. Remember, the 12/10 spacers are to flush the wheels AFTER a drop, which causes increased negative camber, and therefore needs some spacing to get back to where it was before.
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      01-10-2021, 12:24 PM   #233
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Finally the PS4S is available in 285/30-19! This is definitely the way to go

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      01-10-2021, 03:37 PM   #234
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Quote:
Originally Posted by VIERsr View Post
Finally the PS4S is available in 285/30-19! This is definitely the way to go

[IMG]
View post on imgur.com
[/IMG]
Wait. What?

I just looked on Michelin's website and no joy on 285/30/19.

Details? Availability? Link????
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      01-10-2021, 04:32 PM   #235
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Quote:
Originally Posted by flybigjet View Post
Wait. What?

I just looked on Michelin's website and no joy on 285/30/19.

Details? Availability? Link????
Interestingly, the UK site shows them when you inquire by size, but the U.S. site does not. However, if you inquire by vehicle, 2018 M3, the tire shows up. Maybe because it's new?

Honestly, I was getting ready to send Michelin an inquiry on why they don't make this size. I'm looking at purchasing new wheels, and I'm hoping this size will be available.
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      01-10-2021, 04:34 PM   #236
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Quote:
Originally Posted by Rapture1 View Post
Quote:
Originally Posted by flybigjet View Post
Wait. What?

I just looked on Michelin's website and no joy on 285/30/19.

Details? Availability? Link????
Interestingly, the UK site shows them when you inquire by size, but the U.S. site does not. However, if you inquire by vehicle, 2018 M3, the tire shows up. Maybe because it's new?

Honestly, I was getting ready to send Michelin an inquiry on why they don't make this size. I'm looking at purchasing new wheels, and I'm hoping this size will be available.
I have new wheels on order for a mid-March delivery, so I'll be all over this!

Still funny that it's not showing up on Michelin's US website.
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      01-10-2021, 04:59 PM   #237
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      01-11-2021, 10:07 AM   #238
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Sanity check:

Front: MP4S 255/35/19 on 19x9.5 ET28 wheel.
Rear: MP4S 275/35/19 on 19x10.5 ET45 wheel.

Lowered 1/2-3/4" maximum.

Will it rub, or am I safe?

TIA--

R.
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      01-11-2021, 11:45 AM   #239
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Quote:
Originally Posted by Rapture1 View Post
Interestingly, the UK site shows them when you inquire by size, but the U.S. site does not. However, if you inquire by vehicle, 2018 M3, the tire shows up. Maybe because it's new?

Honestly, I was getting ready to send Michelin an inquiry on why they don't make this size. I'm looking at purchasing new wheels, and I'm hoping this size will be available.
On the US TR site the closest PS4S I could only find was 265/35/19 and 265/30/20.

Edit: I guess they do exist...
https://www.onlinetires.com/tires/vi...yABEgLDXvD_BwE

I couldn't find MPS4S 285/30/19 anywhere in the US

Last edited by AlpsRider; 01-11-2021 at 12:39 PM..
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      01-24-2021, 10:01 PM   #240
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Currently thinking of making the switch to 255/275 as well. Im currently on stock setup but with eibach springs (~1inch drop) and 10mm spacers all around. The fitment is perfect for my taste and I don't rub so I kind of want to avoid messing with it but I do want a bit more grip in the rear.

If I make the change to 255/275 will I have to get 5mm spacers to achieve a similar look w/o rubbing or should springs and no spacers do the job close enough?

Also is it time to consider camber plates at that point after making the switch? I do a few track days a year so nothing too crazy.
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      01-24-2021, 10:37 PM   #241
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Quote:
Originally Posted by HS_M2C View Post
Currently thinking of making the switch to 255/275 as well. Im currently on stock setup but with eibach springs (~1inch drop) and 10mm spacers all around. The fitment is perfect for my taste and I don't rub so I kind of want to avoid messing with it but I do want a bit more grip in the rear.

If I make the change to 255/275 will I have to get 5mm spacers to achieve a similar look w/o rubbing or should springs and no spacers do the job close enough?

Also is it time to consider camber plates at that point after making the switch? I do a few track days a year so nothing too crazy.
255/275 is hardly any wider than stock, but IS about .2 inches taller. On stock wheels on an M2C, you'll run a significant chance of rubbing when the wheel is turned-- it's the distance from the front surface of the tire to the wheel shroud that's the issue.

Honestly, after doing a ton of research, if you want a wider tire in back, go with the 265/295-30 combination. It's a bit shorter (smaller diameter) than the stock wheels, but is within tolerances and will give you more contact with the ground. You should be able to compensate for the wider wheel gap with that combination as you have lowering springs.

Just my 0.02.

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      01-29-2021, 08:05 PM   #242
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Replaced Contis with Pilot Sport 4S 255/35 front and 275/35 rear, otherwise stock everything.
Rides much better on bumpy roads due to larger sidewall (+3.5 mm), also much improved grip in tight turns is fun.
Just able to break the rear loose with DSC off.

Here's some pics:

Rear Conti 265/35
Rear PS4S 275/35Front Conti 245/35
Front PS4S 255/35
Conti side view
PS4S side view
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Last edited by Carclassic; 01-29-2021 at 08:07 PM.. Reason: removed hyperlinks
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