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M2 Technical Topics > Wheels / Tires -- Sponsored by The Tire Rack > Increasing tire size from 245/265 to 255/275: any cons ?

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      02-05-2020, 04:18 PM   #155
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I've ordered my last two sets of tires from Costco and just pick them up from the store and refund the installation+disposal fee.

Luckily my cousin has a mount and balance machine so does it for me. I know he'll take much better care not to scratch the wheels than any other shop, plus he does it for cheaper. I miss out on the warranty Costco provides though.
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      02-08-2020, 03:41 PM   #156
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Quote:
Originally Posted by flybigjet View Post
I'm considering swapping out tires when my 2020 M2C finally arrives. I expect it to show up wearing Michelin Pilot Super Sports in (obviously) 245/35/19 and 265/35/19.
I'm **considering** swapping the rubber out with Michelin PS4S in a +1: 255/35/19 and 275/35/19. they're within 1% of the stock rolling diameter and I **think** they'll fit on OEM wheels with OEM suspension with no rubbing.
On my former M2 and my current M2C (both with stock suspension): PS4S 255/35 R19 front + PS4S 275/35 R19 rear (PS4S instead of PSS + 1 size up). Zero rubbing. Zero issues. More grip. Speedometer indication a tad closer to real speed (less speedometer deviation).



See also this overview by forum fellow mToronto:

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      02-09-2020, 11:02 AM   #157
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Quote:
Originally Posted by Artemis View Post
On my former M2 and my current M2C (both with stock suspension): PS4S 255/35 R19 front + PS4S 275/35 R19 rear (PS4S instead of PSS + 1 size up). Zero rubbing. Zero issues. More grip. Speedometer indication a tad closer to real speed (less speedometer deviation).
Thanks-- that's the sizes I'll go with. The 265/285 combination (+2) is just too tight without playing with camber, etc.

Now, I just need the car to get here-- but at least it's in production!

Thanks!

Rod
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      02-09-2020, 11:33 AM   #158
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Quote:
Originally Posted by Artemis View Post
On my former M2 and my current M2C (both with stock suspension): PS4S 255/35 R19 front + PS4S 275/35 R19 rear (PS4S instead of PSS + 1 size up). Zero rubbing. Zero issues. More grip. Speedometer indication a tad closer to real speed (less speedometer deviation).
See also this overview by forum fellow mToronto:
Thanks for your take on the MPS4S.
I wonder how the MPSS with BMW Star rating would be in 255/35 275/35.
I took a drive through the the canyons yesterday with my stock MPSS tires. At the limit they are so smooth balanced and predictable. The whole experience was just perfect. I'd like more grip but I don't want to give up that smooth predictably at the limit. How are the MPS4S tires at the limit? Some have said that in dry warm weather the MPSS are better. Thoughts?
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      02-09-2020, 12:06 PM   #159
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Quote:
Originally Posted by AlpsRider View Post
Thanks for your take on the MPS4S.
I wonder how the MPSS with BMW Star rating would be in 255/35 275/35.
I took a drive through the the canyons yesterday with my stock MPSS tires. At the limit they are so smooth balanced and predictable. The whole experience was just perfect. I'd like more grip but I don't want to give up that smooth predictably at the limit. How are the MPS4S tires at the limit? Some have said that in dry warm weather the MPSS are better. Thoughts?
It's all kinda subjective. I upscaled PSS to PS4S in 2017. Especially wet-handling got improved (improved safety too). When I upscaled PS4S 1 size in 2019 (from 245/35 R19 + 265/35 R19 to 255/35 R19 + 275/35 R19), I also upscaled from 437M to 763M wheels. That complicates (subjective) comparisons.

But here's what I can say: especially once up to temp, DSC nannies are quieter than ever (especially when accelerating out of hairpins) and the set gets you a fraction more grip. Turn-in improved, but for sure the credit for that mainly belongs to 763M (reduced unsprung weight / rotational mass).

As regards technical control of vehicles: upscaling from 245/265 to 255/275 stays within the 'tolerances' band, and, hence, gets a pass over here.

In my book (city + highway + mountain driving), 255/275 PS4S + 763M wins.

End of a sweet pre-breakfast stint on the Stelvio Pass (Italy), allowing the tires and brakes to do their job (tire pressure when firing up the engine around 6am: 2.5/2.6 bar):
Name:  Tire_Temps_June19.jpg
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      02-09-2020, 12:12 PM   #160
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I usually run the canyons in MDM so there's plenty of drift sliding going on. That is the critical part that I want to preserve. The car slides so perfectly in control.

Edit: Ok, I watched the video. It seems that his conclusion answers exactly the question I was asking. I guess all things considered giving up a minute edge at the limit is probably worth the other benefits if the MPS4S. Thanks.

Last edited by AlpsRider; 02-09-2020 at 12:30 PM..
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      02-12-2020, 06:20 PM   #161
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So 275/30 and 295/30 are the closest if not same ratio as stock 245/265? Per the chart above. I definitely have to size up to put the power down, now the question is which size lol? Have been debating this for months, they will need to be replaced in few months. My car is tuned with stock suspension and wheels.
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      02-12-2020, 07:56 PM   #162
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Quote:
Originally Posted by m20e3087 View Post
So 275/30 and 295/30 are the closest if not same ratio as stock 245/265? Per the chart above. I definitely have to size up to put the power down, now the question is which size lol? Have been debating this for months, they will need to be replaced in few months. My car is tuned with stock suspension and wheels.
Seems 265/30, 295/30 19 is the max for stock suspension and wheels without cambers

That's for PS4S tyres. Trofeo R tyre runs wider so not sure if that size will fit

I wanted to run 285/30 19 at the back but no size on PS4S so might have to go 295/30 19. I am concerned about rubbing under max compression cause the offset of my rear wheels is 6mm more aggressive than stock.
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      04-16-2020, 11:42 AM   #163
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Just ordered some Michelin PS4S in 255/35 + 275/35. Stock everything drivetrain wise.

Pumped to see how they look/perform compared to my bald Conti's.
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      04-21-2020, 08:14 AM   #164
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Anyone having issues with TMS? I am getting different readings vs analog monitor. I running 34PSI for all 4, but it's reading 31, 33, 37. I am on 255/275 PS4S which are about a month old
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      04-29-2020, 12:28 PM   #165
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Quote:
Originally Posted by m20e3087 View Post
Anyone having issues with TMS? I am getting different readings vs analog monitor. I running 34PSI for all 4, but it's reading 31, 33, 37. I am on 255/275 PS4S which are about a month old
Mine was off after first install. Had to reset TMPS then it was fine. Same tires and size.
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      04-29-2020, 12:29 PM   #166
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Quote:
Originally Posted by jessetaylor1 View Post
Just ordered some Michelin PS4S in 255/35 + 275/35. Stock everything drivetrain wise.

Pumped to see how they look/perform compared to my bald Conti's.
They're much quieter and softer ride compared to the stock, bald Conti's. Haven't gotten on the car that much though, want to wear in the tires a bit.
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      04-30-2020, 11:56 PM   #167
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Swapped from 255/275 PS4S back to my old OEM 245/265 PSS because the PS4S gripped too well (first world problems, I know). On stock power currently. The smaller PSS has a good balance of grip and slip when you want it compared to the PS4S. The PSS has a "sweet spot" that allows for the rear end to get playful under heavy throttle and allows for more controllable slides if you're into that. The PS4S while being a better overall tire in every way just gripped way too good and took away that "fun factor". It was hard breaking loose the rear end and I feel that it didn't communicate the slip as well as the PSS when it would finally break loose. Will look into swapping back to the PS4S when I increase the power probably.
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      05-05-2020, 03:43 PM   #168
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Quote:
Originally Posted by hlm2c View Post
Swapped from 255/275 PS4S back to my old OEM 245/265 PSS because the PS4S gripped too well (first world problems, I know). On stock power currently. The smaller PSS has a good balance of grip and slip when you want it compared to the PS4S. The PSS has a "sweet spot" that allows for the rear end to get playful under heavy throttle and allows for more controllable slides if you're into that. The PS4S while being a better overall tire in every way just gripped way too good and took away that "fun factor". It was hard breaking loose the rear end and I feel that it didn't communicate the slip as well as the PSS when it would finally break loose. Will look into swapping back to the PS4S when I increase the power probably.
Insightful thank you, confirms my fear re the PS4S, I know first hand how this tyre acts like it has glue on the outside of it.

PSS is so predictable at low and high speed when you lose grip, while you could actually go faster in PS4S I wouldn't be suprised if the PSS felt faster as it lost traction just that little bit.

Like you I am on stock power, which sometimes I feel is right, then sometimes I want more because, more is more
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      05-08-2020, 08:38 AM   #169
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I wonder if I'd be able to go 255/275 with my ride height without rubbing.
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      05-08-2020, 02:02 PM   #170
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Quote:
Originally Posted by hlm2c View Post
Swapped from 255/275 PS4S back to my old OEM 245/265 PSS because the PS4S gripped too well (first world problems, I know). On stock power currently. The smaller PSS has a good balance of grip and slip when you want it compared to the PS4S. The PSS has a "sweet spot" that allows for the rear end to get playful under heavy throttle and allows for more controllable slides if you're into that. The PS4S while being a better overall tire in every way just gripped way too good and took away that "fun factor". It was hard breaking loose the rear end and I feel that it didn't communicate the slip as well as the PSS when it would finally break loose. Will look into swapping back to the PS4S when I increase the power probably.
I too am on the fence about going +1 on the size, I did this with my old E92 M3 and found the road feel became numb.. the car just didn't feel as nimble and light and fun as with the standard PSS tire sizes. Worried going +1 on the M2C will result in the same feeling.. plus going from PSS to PS4S will additionally change the feel. I do want the PS4S for the wet capability and additional grip, just don't want to lose any road feel and nimbleness. Anyone else feel like they lost some nimbleness when going +1? The assumption is that BMW engineers chose the 245/265 size for the M2 for a reason...
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      05-12-2020, 06:29 PM   #171
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Can someone who has done it please confirm.

I had a service on mine yesterday and all four tyres have worn on the inside edge so need replacing.

Standard M2C wheels, do I put 265 35's and 285 35's or 265 35 and 285 30's.

Thanks
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      05-13-2020, 12:30 AM   #172
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Quote:
Originally Posted by HFW003 View Post
Can someone who has done it please confirm.

I had a service on mine yesterday and all four tyres have worn on the inside edge so need replacing.

Standard M2C wheels, do I put 265 35's and 285 35's or 265 35 and 285 30's.

Thanks
265/35 will probably rub in the fronts.. Honestly 255/35 fronts and 275/35 rears PS4S is a solid choice if you want to retain 35 side wall. Otherwise, if you do 30 sidewall, 265/285 or 265/295 will work too.
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      05-14-2020, 12:32 PM   #173
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Quote:
Originally Posted by m0butt View Post
I wonder if I'd be able to go 255/275 with my ride height without rubbing.
Wow, just amazing. What suspension are you running?
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      05-14-2020, 12:33 PM   #174
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Quote:
Originally Posted by AZ-Wildcat View Post
Quote:
Originally Posted by m0butt View Post
I wonder if I'd be able to go 255/275 with my ride height without rubbing.
Wow, just amazing. What suspension are you running?
Lol thank you for the kind words. I'm running KW V3s.
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      05-14-2020, 02:59 PM   #175
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Quote:
Originally Posted by m0butt View Post
Lol thank you for the kind words. I'm running KW V3s.
Nice, love the classic BBS look. I think you should be posting more pictures.
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      05-14-2020, 03:54 PM   #176
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Lol thank you for the kind words. I'm running KW V3s.
Stance looks great. I’m on Long Island—how has the KW suspension been on our area roads? I’ve been bothered by the “jittery,” nervous feeling of the M2C’s stock suspension on bumpy roads. Especially small, closely-spaced surface irregularities. Feels unsettled, like it needs to be more compliant to grip adequately. I hate the feeling.
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