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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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      05-14-2020, 04:03 PM   #177
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Quote:
Originally Posted by m0butt View Post
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.
Surprisingly been more comfortable. I switched back to stock because I thought the KWs were making a sound but it turns out I have a loose panel in my driver footwell. The KWs are going right back on, I loved how they felt and the car looks so much better lowered. I'm just not sure if I can do 255/275, because when I was on stock wheels with 10mm spacers, I rubbed a lot.
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      05-17-2020, 09:51 AM   #178
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30 sidewall on 265 front and 295 rear works very well, compare the front and rear changes to circumferences:


Front:

https://www.willtheyfit.com/index.ph...h=9&offset2=29


Rear:

https://www.willtheyfit.com/index.ph...=10&offset2=40
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      05-19-2020, 10:51 AM   #179
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Quote:
Originally Posted by MagnusT View Post
30 sidewall on 265 front and 295 rear works very well, compare the front and rear changes to circumferences:


Front:

https://www.willtheyfit.com/index.ph...h=9&offset2=29


Rear:

https://www.willtheyfit.com/index.ph...=10&offset2=40
Although I agree with what you wrote, I'd be careful using willtheyfit for anything other than wheel size/offset, as the OD's are just calculations, not real tires. Beyond that, the fitment doesn't take into account the very different shapes of all season tires compared to Summer tires, and the stretch it calculates is just a calculation, not reality.

The tire specs on tirerack are still the best source of fitment information when it comes to tires.
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      05-19-2020, 11:00 AM   #180
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Agree 100%, it's more for checking the wheel/rim sizes rather than tire sizes. But for comparing circumference changes with different tires it works well.
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      05-29-2020, 10:28 PM   #181
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with MP Coilovers?

I carefully read through each post. Great questions and responses. Though I haven't found the specific answer I'm looking for.

I'd like to increase my PSC2 from the stock sizes to 255/35 front and 275/35 rear. I'm running the 763M with M Perf coilovers set to BMW recommended height (about 3/4" drop). I do not plan on camber plates. I prefer not to use spacers because I'm tracking it.

Can someone confirm the larger 255/275 tires will not rub with my setup?

Thank you!
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      06-04-2020, 11:10 PM   #182
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Quote:
Originally Posted by m0butt View Post
The KWs are going right back on, I loved how they felt and the car looks so much better lowered. I'm just not sure if I can do 255/275, because when I was on stock wheels with 10mm spacers, I rubbed a lot.
Will it rub without the spacers? I'm trying to determine the answer to my post above.

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      06-07-2020, 08:52 AM   #183
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Running 245/265 Sport cup 2's all round which I've become used to even drifting the behaviour of them is significantly different then PSS or PS4S people call me a lunatic for drifting in the wet on SC2's however I'd say they're for me now easier to drift then PSS, thinking of going 244/275 so +1 at the rear just wanted to get some feedback of people who've done 1 size up at the rear and left the front stock? Or if it's better to do +1 all around? Or just keep it how it is, I don't do much track just B roads and drifting
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      07-27-2020, 08:08 AM   #184
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Ok So areas are of my rears are now under 3mm which Is when I start to look to replace. Especially right now I can get 15% off tyres from a well known UK site which is a good discount.

does 255 up front kick more stones rearward?

255/275 used to be cheaper but not much in it anymore.

So i'm tempted to go OE sizes and then at a later time try 255/275 for comparison.
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      07-27-2020, 09:54 PM   #185
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Quote:
Originally Posted by 3t3p View Post
Ok So areas are of my rears are now under 3mm which Is when I start to look to replace. Especially right now I can get 15% off tyres from a well known UK site which is a good discount.

does 255 up front kick more stones rearward?

255/275 used to be cheaper but not much in it anymore.

So i'm tempted to go OE sizes and then at a later time try 255/275 for comparison.
Physically, it should. Not sure if enough to notice though.
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      08-13-2020, 08:15 PM   #186
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Hi, this looks like the best thread to post this in. I have been running General G-Max RS's 255/275 for about 6 months (great tires BTW for the $). I got a low tire pressure alarm today. What pressure do you guys run? Not sure if I stay with the M2 numbers or the M4 numbers with the bigger tire or something else. Thanks.
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      08-14-2020, 02:36 PM   #187
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Quote:
Originally Posted by SergioC View Post
Hi, this looks like the best thread to post this in. I have been running General G-Max RS's 255/275 for about 6 months (great tires BTW for the $). I got a low tire pressure alarm today. What pressure do you guys run? Not sure if I stay with the M2 numbers or the M4 numbers with the bigger tire or something else. Thanks.
I run 35 psi all around.
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      08-14-2020, 02:45 PM   #188
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Quote:
Originally Posted by SergioC View Post
Hi, this looks like the best thread to post this in. I have been running General G-Max RS's 255/275 for about 6 months (great tires BTW for the $). I got a low tire pressure alarm today. What pressure do you guys run? Not sure if I stay with the M2 numbers or the M4 numbers with the bigger tire or something else. Thanks.
Coming from the Lotus world, I run higher pressures where the weight is, so I try to be 36 front, 35 rear most of the time. But to get a bit more bite when it starts to get cold (before I swap my Winter set on), I have been known to run 35/33.
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      08-14-2020, 03:21 PM   #189
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      08-16-2020, 08:48 AM   #190
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Thank you guys
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      08-16-2020, 11:02 AM   #191
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Quote:
Originally Posted by johnnyace View Post
Quote:
Originally Posted by m0butt View Post
The KWs are going right back on, I loved how they felt and the car looks so much better lowered. I'm just not sure if I can do 255/275, because when I was on stock wheels with 10mm spacers, I rubbed a lot.
Will it rub without the spacers? I'm trying to determine the answer to my post above.

Without spacers don't think it would've rubbed at all.
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      08-19-2020, 02:28 PM   #192
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What is the best tire size for:
- michelin cup2 tires only
- exclusively track use
- 763 rims
- stock suspension and no camber plates

Is it the oem size 245+265 or is there a better solution?
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      08-19-2020, 02:46 PM   #193
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Quote:
Originally Posted by kart driver View Post
What is the best tire size for:
- michelin cup2 tires only
- exclusively track use
- 763 rims
- stock suspension and no camber plates

Is it the oem size 245+265 or is there a better solution?
First, it's best to keep roughly 20mm difference in width between the front and rear to maintain the original balance of the car.

So that means:

245/265
265/285
275/295

Since there is no 285 at all, and no 295/30, I'd recommend sticking with the original sizes in the Cup 2.
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      08-19-2020, 03:34 PM   #194
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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.
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      08-19-2020, 05:36 PM   #195
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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.

Interesting. Thanks for the info!

But I presume there is no difference between those different cup2s.
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      08-19-2020, 05:49 PM   #196
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Quote:
Originally Posted by kart driver View Post
Interesting. Thanks for the info!

But I presume there is no difference between those different cup2s.
For the BMW * versions, it's likely they're very close. For the MO and N0 versions, you never know what the OEM desired specifications turned out to be...for example some OEMs want a tire that has great grip initially and then a slower wearing compound gets revealed, etc; there's a wide range in what a specific manufacturer spec tire can be tuned to deliver (among all the tuning variables).
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      08-20-2020, 03:01 AM   #197
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Quote:
Originally Posted by CSBM5 View Post
For the BMW * versions, it's likely they're very close. For the MO and N0 versions, you never know what the OEM desired specifications turned out to be...for example some OEMs want a tire that has great grip initially and then a slower wearing compound gets revealed, etc; there's a wide range in what a specific manufacturer spec tire can be tuned to deliver (among all the tuning variables).

Got it. Thanks a lot for clarification.
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      08-20-2020, 10:27 AM   #198
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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.
What I want to know is which set Joe got. They are 245/265, but considerably wider than any 245/265 available. They are the new Connect, but have the old logo. In short, they are ghost tires, and I want them.
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