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      03-22-2023, 03:41 AM   #1
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Hi guys

Anyone running 295/30 20 rear on the rear end and standard 275l35 19 on the front?

How does it drive? Any noticeable increase in launch given the slightly enlarged contact patch? Any additional understeer? I'm not concerned about rub.

And are you running RWD or Xdrive?

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      03-22-2023, 08:11 PM   #2
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I have a 295/30/20 rear no issues
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      03-22-2023, 09:36 PM   #3
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RWD... running 295x30x20 rears and 285x30x20 front... offset 10mm all around. No issues at all with the rears. The fronts tend to rub when reversing and to the right, but it's minimal.
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      03-23-2023, 02:13 AM   #4
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Quote:
Originally Posted by wtwo3 View Post
RWD... running 295x30x20 rears and 285x30x20 front... offset 10mm all around. No issues at all with the rears. The fronts tend to rub when reversing and to the right, but it's minimal.
Thanks for the reply. I'm not too concerned with the rubbing, more interested in the performance effects, did you notice and additional launch capability with the extra grip for example, could the car launch or accelerate harder, less slip under hard acceleration, etc due to the wider rubber?
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      03-23-2023, 03:44 AM   #5
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Quote:
Originally Posted by M Division View Post
Thanks for the reply. I'm not too concerned with the rubbing, more interested in the performance effects, did you notice and additional launch capability with the extra grip for example, could the car launch or accelerate harder, less slip under hard acceleration, etc due to the wider rubber?
Unfortunately this I can't really tell you. I replaced the stock tires while I was still in break-in, so I don't have a comparison point. All I can say is the car has a ton of grip for being only RWD. And, in theory, more contact patch should = more grip.
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      03-24-2023, 09:20 PM   #6
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Quote:
Originally Posted by wtwo3 View Post
RWD... running 295x30x20 rears and 285x30x20 front... offset 10mm all around. No issues at all with the rears. The fronts tend to rub when reversing and to the right, but it's minimal.
Are the front wheels 10”?
I am going to run the same set up with 10” front at 5mm offset. I’m hoping to avoid rubbing.
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      03-24-2023, 10:10 PM   #7
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Originally Posted by Skyscraper View Post
Are the front wheels 10”?
I am going to run the same set up with 10” front at 5mm offset. I’m hoping to avoid rubbing.
9.5" at the front and 10.5" at the rear. With the 10mm offset, the rubbing is very minimal.. only at a certain degree reversing to the right. Going forward even at full lock I haven't noticed any rubbing.
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      03-25-2023, 01:10 AM   #8
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295/30/20 is out if youre an xDrive G8X. 1.5% is too far out. Half the people that post, asking about tire size suggestions, dont own the same car as people that are saying the compounds are good for. You have to pay attention to the circumferential difference, front to rear on the xDrive. On the tire calculator, 295/30/20 mixed with an OEM front size, doesnt work.

If youre xDrive, its a waste of time, and money to go to a compound that they dont make in BMW spec. BMW doesnt make a 295/30/20 tire for the G8X, so, youre removing a tire that has a hybrid PS4S and Sport Cup 2 mix, for an off the shelf tire that doesnt.

I'll post 2 pictures, below. One shows the 1.5% variance in tire sizing that just wont work with the xDrive. and the other shows how much better the BMW* spec tire is. Its made of 4 compounds instead of 2. If you go to a 295, which if youre xDrive, you cant, without changing the front tire size, as well, youre also going to an inferior tire compound.
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      03-25-2023, 10:17 AM   #9
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Not X drive and not racing.
The Bridgestone or Mecedies spec Bridgestone rears will be fine.
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      03-25-2023, 06:41 PM   #10
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Quote:
Originally Posted by Limegrntaln View Post
295/30/20 is out if youre an xDrive G8X. 1.5% is too far out. Half the people that post, asking about tire size suggestions, dont own the same car as people that are saying the compounds are good for. You have to pay attention to the circumferential difference, front to rear on the xDrive. On the tire calculator, 295/30/20 mixed with an OEM front size, doesnt work.

If youre xDrive, its a waste of time, and money to go to a compound that they dont make in BMW spec. BMW doesnt make a 295/30/20 tire for the G8X, so, youre removing a tire that has a hybrid PS4S and Sport Cup 2 mix, for an off the shelf tire that doesnt.

I'll post 2 pictures, below. One shows the 1.5% variance in tire sizing that just wont work with the xDrive. and the other shows how much better the BMW* spec tire is. Its made of 4 compounds instead of 2. If you go to a 295, which if youre xDrive, you cant, without changing the front tire size, as well, youre also going to an inferior tire compound.
Great info thanks for the reply. Yes I'm very aware of the 1% rule for Xdrive as I upgraded my G42 front and rears. And the BMW * Michi are certainly a step above the standard PS4s, 4 compound vs 2, etc etc.

I'm specifically curious if anyone has upgraded to 295 width /30profile on the 20" and noticed any difference in performance eg: launch grip or lateral grip. Primarily interested in RWD but it seems not many have done thebl upgrade.
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      03-27-2023, 05:39 PM   #11
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I've done the upgrade but have nothing to offer beyond the obvious, that more rear tire on RWD is needed - especially at higher HP. 295 is not enough to cause undesirable understeer, so there really is no downside. I'm running PS Cups and the lateral grip is great. My CSL is not broken in yet but have broken the rears loose in 3rd several times at less than WOT. I would probably get 305 next time but too early to tell.
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      03-27-2023, 07:28 PM   #12
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Quote:
Originally Posted by Hit_Apex View Post
I've done the upgrade but have nothing to offer beyond the obvious, that more rear tire on RWD is needed - especially at higher HP. 295 is not enough to cause undesirable understeer, so there really is no downside. I'm running PS Cups and the lateral grip is great. My CSL is not broken in yet but have broken the rears loose in 3rd several times at less than WOT. I would probably get 305 next time but too early to tell.
Yes perfect that makes sense. Good to hear no extra understeer or sidewall flex loosening up the rear end or anything. I considered 305 but start to concerned about going to far into understeer land unless the front also gets the treatment - but how far do you want to go.

Thanks.
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      03-29-2023, 02:36 AM   #13
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Quote:
Originally Posted by Limegrntaln View Post
295/30/20 is out if youre an xDrive G8X. 1.5% is too far out. Half the people that post, asking about tire size suggestions, dont own the same car as people that are saying the compounds are good for. You have to pay attention to the circumferential difference, front to rear on the xDrive. On the tire calculator, 295/30/20 mixed with an OEM front size, doesnt work.

If youre xDrive, its a waste of time, and money to go to a compound that they dont make in BMW spec. BMW doesnt make a 295/30/20 tire for the G8X, so, youre removing a tire that has a hybrid PS4S and Sport Cup 2 mix, for an off the shelf tire that doesnt.

I'll post 2 pictures, below. One shows the 1.5% variance in tire sizing that just wont work with the xDrive. and the other shows how much better the BMW* spec tire is. Its made of 4 compounds instead of 2. If you go to a 295, which if youre xDrive, you cant, without changing the front tire size, as well, youre also going to an inferior tire compound.
I am also not sure whether wider tyres will gain much contact patch increase. The contact patch is a function of tyre pressure, car weight and tyre structure. So a wider tyre may actually have a wider but narrower contact patch as the weight is spread over the same area. However it may improve longitudinal grip on corners. What what I’ve read the physics of all this is quite complicated!
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      03-31-2023, 01:25 AM   #14
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Quote:
Originally Posted by davidmct-M3 View Post
I am also not sure whether wider tyres will gain much contact patch increase. The contact patch is a function of tyre pressure, car weight and tyre structure. So a wider tyre may actually have a wider but narrower contact patch as the weight is spread over the same area. However it may improve longitudinal grip on corners. What what I’ve read the physics of all this is quite complicated!
I’d also go so far as to say, the point I’m usually trying to get across is, I don’t think you’re gaining anything by going to an inferior tire compound.

The BMW Star 285 is a 4 compound tire, made out of half PS4S and half Sport Cup 2. Going to a 295 section tire, just because it’s 10mm wider, and is only comprised of the standard 2 compound PS4S, I think you’re losing more in compound, than you are in width.
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      03-31-2023, 02:14 AM   #15
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Quote:
Originally Posted by Limegrntaln View Post
I’d also go so far as to say, the point I’m usually trying to get across is, I don’t think you’re gaining anything by going to an inferior tire compound.

The BMW Star 285 is a 4 compound tire, made out of half PS4S and half Sport Cup 2. Going to a 295 section tire, just because it’s 10mm wider, and is only comprised of the standard 2 compound PS4S, I think you’re losing more in compound, than you are in width.
Agree. Grip is primarily determined by friction coefficient (tyre compound, temperature, slip angle etc) and pressure per unit area from weight. This varies depending on road and tyre conditions and dynamics etc

Real world measurement
https://www.tyrereviews.com/Article/...wide-tyres.htm

Detailed theory of grip
http://theracingline.net/2018/race-c...d-tyre-forces/

https://tiresvote.com/articles/every...contact-patch/
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      03-31-2023, 11:58 AM   #16
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Quote:
Originally Posted by davidmct-M3 View Post
Agree. Grip is primarily determined by friction coefficient (tyre compound, temperature, slip angle etc) and pressure per unit area from weight. This varies depending on road and tyre conditions and dynamics etc

Real world measurement
https://www.tyrereviews.com/Article/...wide-tyres.htm

Detailed theory of grip
http://theracingline.net/2018/race-c...d-tyre-forces/

https://tiresvote.com/articles/every...contact-patch/
Perfect example.
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      04-09-2023, 07:33 AM   #17
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Quote:
Originally Posted by Hit_Apex View Post
I've done the upgrade but have nothing to offer beyond the obvious, that more rear tire on RWD is needed - especially at higher HP. 295 is not enough to cause undesirable understeer, so there really is no downside. I'm running PS Cups and the lateral grip is great. My CSL is not broken in yet but have broken the rears loose in 3rd several times at less than WOT. I would probably get 305 next time but too early to tell.
Mate are you running these on the stock wheels of your csl? Cause according to BMW and the car-papers 295 does not fit (i.e is not allowed)?

Thx for your reply cause I have my running in next week on my csl and potentially consider such change
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      04-09-2023, 10:07 AM   #18
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Quote:
Originally Posted by Jamal82 View Post
Mate are you running these on the stock wheels of your csl? Cause according to BMW and the car-papers 295 does not fit (i.e is not allowed)?

Thx for your reply cause I have my running in next week on my csl and potentially consider such change
Yes, stock rims. Michelin specs a rim width of 10-11” for 295/30 20” tires. 305 would the maximum for the stock 10.5” rims. BMW recommends 285 and probably look the best. 305 will look a bit balloonish. Here is what 295 looks like with 15mm spacers (not needed to accommodate wider tires). I would change spacers to 10mm with 305.
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      04-09-2023, 10:16 AM   #19
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Thx so much for your reply and feeback, great car man !!!!

Would then also Yokohama Advan A052 295/30 20 fit on the stock rim?

Thx again so much, honestly!! Cheers
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      05-13-2023, 02:03 PM   #20
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What rear spacers are you guys running with 295’s? I’m on 11mm and rubbing
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      10-22-2023, 05:23 PM   #21
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Lost the tire lottery and got the PZeros. Shitty tires concerning grip. The rears were worn just below the wear bars and oversteer was constant in 4WD even when unprovoked. I didn't notice that oversteer when they were newer. I was hoping the 295/30/20 PZero would provide better rear end grip as a replacement once I get my winter tires off, but it seems that +1.5% difference would throw the xDrive off.

On that note, I thought xDrive on this car was more variable and that 1.5% difference shouldn't matter, but for some reason, an earlier poster in this thread seems to think that 1.5% is too much for it to handle.

Any else know about this xDrive's limitations concerning overall diameter differences?
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      10-23-2023, 12:07 PM   #22
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Quote:
Originally Posted by GTS Daddy View Post
Lost the tire lottery and got the PZeros. Shitty tires concerning grip. The rears were worn just below the wear bars and oversteer was constant in 4WD even when unprovoked. I didn't notice that oversteer when they were newer. I was hoping the 295/30/20 PZero would provide better rear end grip as a replacement once I get my winter tires off, but it seems that +1.5% difference would throw the xDrive off.

On that note, I thought xDrive on this car was more variable and that 1.5% difference shouldn't matter, but for some reason, an earlier poster in this thread seems to think that 1.5% is too much for it to handle.

Any else know about this xDrive's limitations concerning overall diameter differences?
I still am above wear bars (and always change at 3mm anyway). In the uk I don’t experience understeer or oversteer on the PZero4 which we get here unless pushing very hard. I have noticed when driving across the pond your roads seem much more slippery and tyres are much harder compound to meet wear mile targets.

Also pushing on track at Brandshatch on same tyres but RWD was also neutral.
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