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? Thanks |
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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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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03-24-2023, 09:20 PM | #6 | |
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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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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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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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Thanks. |
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03-29-2023, 02:36 AM | #13 | |
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03-31-2023, 01:25 AM | #14 | |
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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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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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04-09-2023, 07:33 AM | #17 | |
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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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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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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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Also pushing on track at Brandshatch on same tyres but RWD was also neutral. |
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