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      04-21-2017, 08:47 AM   #23
Wlodi
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295?
From what I see here 285 is "the perfect match" .

http://www.willtheyfit.com/index.php...=10&offset2=32

What is the tolerance between front and rear?
Is it 1% or 3%?

Another question - how long do you drive on this setup ? No issues with the drivetrain?

Last edited by Wlodi; 04-21-2017 at 09:43 AM..
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      04-21-2017, 01:22 PM   #24
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Between the responses from upstate650 and I, you should be able to understand that the 255/295 is absolutely perfect. Now... If you go 285 you will need to go with the 245s. I have already told you I have xdrive, what size my wheels and tires are, and that the fitment is perfect. It's your call with what you do. Upstate is a smart dude and was very helpful. He pointed me towards the 295 and 255 set up and I am incredibly happy. Trust him.
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      04-21-2017, 02:05 PM   #25
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Quote:
Originally Posted by Wlodi View Post
295?
From what I see here 285 is "the perfect match" .

http://www.willtheyfit.com/index.php...=10&offset2=32

What is the tolerance between front and rear?
Is it 1% or 3%?

Another question - how long do you drive on this setup ? No issues with the drivetrain?
255/35 and 295/30 ARE EXACTLY THE SAME DIAMETER. 0% difference. Because there is no difference in diameter, there is zero effect on drivetrain. don't use some generic calculator on the net for tires. Go to tire rack and look at the tires you would actually be using and their measurements - either the pirellis or the michelins probably.

Look, you can use whatever you want. I'm just telling you, based on experience, aesthetics, and science, that 255/35 295/30 is the perfect set up for the M5 wheels on an x drive 6 series. Good luck with whatever decision you make.
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      04-21-2017, 02:06 PM   #26
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Thank You all.

Im asking because I bought wheels from a guy who was selling them because he damaged his drivetrain (I think he used M5 tires) and on the other hand Deda in this topic said he is using 245/275 wheels which I have already bought and im just thinking whether I should replace the back at the seller before putting the 343M on or not.
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      04-21-2017, 02:20 PM   #27
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you can use 245/275 set up. They will work, but they will look a little stretched. they are designed for an 8.5" front wheel and a 9" rear wheel, not a 9" front and 10" rear

The stock M5 setup is 265/35 and 295/30 - you cant use that setup without switching out the fronts for 255/35.
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      04-21-2017, 02:46 PM   #28
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I am just amazed that BMW recommends using tire sizes that are not best for the xdrive. ( I mean that even on 8inch front/8,5inch rear the 245/275 setup wheels is do not have the same size - 0,9% difference between them while 265/295 is 1,3% and it damaged the xdrive)

I guess I have my answer
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      04-22-2017, 10:27 AM   #29
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Quote:
Originally Posted by Wlodi View Post
I am just amazed that BMW recommends using tire sizes that are not best for the xdrive. ( I mean that even on 8inch front/8,5inch rear the 245/275 setup wheels is do not have the same size - 0,9% difference between them while 265/295 is 1,3% and it damaged the xdrive)

I guess I have my answer
Good luck Wlodi and please post pics when you get them mounted and on your car!
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      04-22-2017, 11:19 AM   #30
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Went for the 245/275 in the end anyway.
I could not find anything in good pricing in 245/285 setup.
Stayed with Michelin PS4S.
In the xdrive the front tires get used faster than rear so overtime there should be no issues.
Looking at the wheels I do not see any stretch.





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      04-24-2017, 08:38 AM   #31
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stay away from curbs. You have no rim protection at all!
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      03-05-2018, 04:11 PM   #32
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Sorry to bring up an old thread, im a novice when it comes to wheels/tires fitment. I just recently put a set of M5 343M wheels and tires onto my 2014 640i Xdrive F12. I only drove about 30miles, and the rear rubbed twice on certain bumps. Tires are Michelin Super Sport Cup 2's, in 265/30/20, and 295/30/20. I saw that some of you recommend the 255/35/20 and 295/30/20 setup as a perfect fitment. However, if I go with that, should I expect the rear to continue rubbing?

I was looking to order the Continental ExtremeContact DWS 06. If the 255/35 and 295/30 is expected to continue rubbing, is 245/35/20 and 275/30/20 my next best option for fitment and to avoid xdrive issues?

Thanks in advance.
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      03-06-2018, 07:59 AM   #33
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Originally Posted by tpsc3crt View Post
Sorry to bring up an old thread, im a novice when it comes to wheels/tires fitment. I just recently put a set of M5 343M wheels and tires onto my 2014 640i Xdrive F12. I only drove about 30miles, and the rear rubbed twice on certain bumps. Tires are Michelin Super Sport Cup 2's, in 265/30/20, and 295/30/20. I saw that some of you recommend the 255/35/20 and 295/30/20 setup as a perfect fitment. However, if I go with that, should I expect the rear to continue rubbing?

I was looking to order the Continental ExtremeContact DWS 06. If the 255/35 and 295/30 is expected to continue rubbing, is 245/35/20 and 275/30/20 my next best option for fitment and to avoid xdrive issues?

Thanks in advance.
It is weird that your rear is rubbing, as others, including me, run a 295/30/20 with no rubbing. Maybe the suspension on the convertible is different? Or maybe the cup 2 tires are a little beefier - I don't know anyone else running those. To answer your question about whether switching your front tires out (which you should do) will cause your rear tires to no longer rub - the answer is, as I'm sure you already know, a resounding no.

Cup 2 tires are super soft, right? if you put any kind of miles on your car, they will wear down quick. Based on other's experiences, you must be just touching at full suspension compression. With some tire wear, you will likely find they no longer rub. Next time, use a different tire.

By the way, the comment by wlodi in a post above yours that front tires wear faster than the rears on a 650 x drive is dead wrong. The rears wear at least 2 times faster on tires I have been using. Consequently, I think your rubbing will disappear with time.
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      03-06-2018, 04:39 PM   #34
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Appreciate the info. The Cup 2's came used with my used purchase of the wheels. So they're not new. I was hoping i'd be able get some mileage out of them before having to replace the tires... and yes, theyre really soft. Previously owner used them for the track. The rubber on them is pretty chunked up, aside from the rears. I just dont want to spend a wad of money on 255/295, if the rear is just going to continue rubbing. The bumps I hit werent even that horrendous for NY roads. So i'm trying to decide on 245/275 or 255/295, unless I can swing 255/285 as an option without issues. Any thoughts on that?
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      03-06-2018, 04:54 PM   #35
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Quote:
Originally Posted by tpsc3crt View Post
Appreciate the info. The Cup 2's came used with my used purchase of the wheels. So they're not new. I was hoping i'd be able get some mileage out of them before having to replace the tires... and yes, theyre really soft. Previously owner used them for the track. The rubber on them is pretty chunked up, aside from the rears. I just dont want to spend a wad of money on 255/295, if the rear is just going to continue rubbing. The bumps I hit werent even that horrendous for NY roads. So i'm trying to decide on 245/275 or 255/295, unless I can swing 255/285 as an option without issues. Any thoughts on that?
MSUGOGRN runs 295/30 on the rear of his convertible without issue. I would bet its the Cup 2 tires. A little rubbing isn't a big deal - let them go for a while and see if it goes away.

The 245/275 setup would look stretched on 9 and 10 inch wheels.

I wouldn't run 255/285 on an x drive vehicle. Look up the size difference to see what you think, but also remember the rears will wear twice as fast as the fronts, increasing the difference
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      03-07-2018, 09:04 PM   #36
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Quote:
Originally Posted by upstate650 View Post
MSUGOGRN runs 295/30 on the rear of his convertible without issue. I would bet its the Cup 2 tires. A little rubbing isn't a big deal - let them go for a while and see if it goes away.

The 245/275 setup would look stretched on 9 and 10 inch wheels.

I wouldn't run 255/285 on an x drive vehicle. Look up the size difference to see what you think, but also remember the rears will wear twice as fast as the fronts, increasing the difference
I thought as long as the difference between front and rear tires is 30mm on Xdrives it's fine. I was running on 255/285 on 373 and I took them off after 3 weeks. It damaged the transmission. So you think if I change the 288 to 295 it will be fixed?
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      03-08-2018, 08:48 AM   #37
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Originally Posted by Armin_kh View Post
I thought as long as the difference between front and rear tires is 30mm on Xdrives it's fine. I was running on 255/285 on 373 and I took them off after 3 weeks. It damaged the transmission. So you think if I change the 288 to 295 it will be fixed?
A 295/30/20 tire is 27" tall. So is a 255/35/20, which is why they are a perfect match.

A 285/30/20 is only 26.7" tall, so you are starting out with a difference of just over 1% when the tires are brand new.

Tread depth is 10mm. At half wear on the rears, the tire will only be 26.3-26.4" tall. If the front are wearing half as fast at the rears, the front tire is now 26.8-26.9" tall. The difference is around half an inch, which is approximately 2%.

The generally accepted limits in tire height difference for the x drive system is 1%. But this applies at every point during the life cycle of the tires. So if you start out with a 1% difference, you need to know what will happen to that percentage over time. On the 6 series, the height difference will increase over time because the rears wear faster than the front, and on the setup you are using the rear is already the smaller tire.

To answer your question, a 30 mm difference is roughly 4% on these cars, which is 4x what BMW recommends, and would be very bad for your X drive system. Switching your rears from 285/30 to 295/30 won't reverse any damage you have already done, but it will work fine on your car and will not cause any further damage. I've run through 3 sets of rears and one set of fronts on my car with 255/35 front and 295/30 rear with no issues.
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Last edited by upstate650; 03-08-2018 at 08:57 AM..
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      03-08-2018, 09:42 PM   #38
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Quote:
Originally Posted by upstate650 View Post
A 295/30/20 tire is 27" tall. So is a 255/35/20, which is why they are a perfect match.

A 285/30/20 is only 26.7" tall, so you are starting out with a difference of just over 1% when the tires are brand new.

Tread depth is 10mm. At half wear on the rears, the tire will only be 26.3-26.4" tall. If the front are wearing half as fast at the rears, the front tire is now 26.8-26.9" tall. The difference is around half an inch, which is approximately 2%.

The generally accepted limits in tire height difference for the x drive system is 1%. But this applies at every point during the life cycle of the tires. So if you start out with a 1% difference, you need to know what will happen to that percentage over time. On the 6 series, the height difference will increase over time because the rears wear faster than the front, and on the setup you are using the rear is already the smaller tire.

To answer your question, a 30 mm difference is roughly 4% on these cars, which is 4x what BMW recommends, and would be very bad for your X drive system. Switching your rears from 285/30 to 295/30 won't reverse any damage you have already done, but it will work fine on your car and will not cause any further damage. I've run through 3 sets of rears and one set of fronts on my car with 255/35 front and 295/30 rear with no issues.
Thank you for the info. I'm planning to change my 373s to 343s. I have bought 2 different sets in the past 1 year and none of them worked well with my car. I just wanna buy the right size and enjoy the look of my car. I wanna buy a size that works well with 373s and 343s. Do you recommend 275/245 or 285/255?
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      03-09-2018, 08:53 AM   #39
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Quote:
Originally Posted by Armin_kh View Post
Thank you for the info. I'm planning to change my 373s to 343s. I have bought 2 different sets in the past 1 year and none of them worked well with my car. I just wanna buy the right size and enjoy the look of my car. I wanna buy a size that works well with 373s and 343s. Do you recommend 275/245 or 285/255?
do you want one set of tires that will fit both the 373 and 343? The 275/245 set will fit the 373 perfect (its the factory setup), but will be a bit stretched on the 343. the 295/255 setup will bulge a bit on the rear of the 373, but will fit the 343 perfect. For the reasons I stated in my post above, I wouldn't run 255/285 on anything.

If your intention is to make a permanent switch to the 343, but you will run the tires on the 373 wheels briefly until you get them, I would go with the 295/255 setup. The rears last approximately 8-10K miles depending on the tire and usage, so take that into consideration with the timing of your wheel and tire purchase.
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      03-11-2018, 12:49 AM   #40
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yeah I have been wanting to switch to 245/285 or 255/295 setup, like upstate says, its exact same rolling diameter, but it just boggles my mind what did BMW engineers have in mind when they made the car 245/275 from the factory, did they get a better price in that size or what?
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      03-11-2018, 03:21 AM   #41
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Hello all,after 3 years i need to say that 245/275 will run on 343M for M5 perfect,but rim protection is ZERO..so my next setup will be 255/295...thank you upstate 650 for all info!

Any info about michelin ps4?

Best regards to all members!
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      03-17-2018, 09:38 AM   #42
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Upstate you are the man, this is a super helpful thread.

I have a 650i gran coupe RWD and looking to buy M5 601 wheels. I assume the 255/295 will work on my car... The only concern I have is that the 601 wheels are slightly wider than the 343's

Any truth to that and would that tire setup work for my f06?
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      03-18-2018, 06:17 AM   #43
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Upstate you are the man, this is a super helpful thread.

I have a 650i gran coupe RWD and looking to buy M5 601 wheels. I assume the 255/295 will work on my car... The only concern I have is that the 601 wheels are slightly wider than the 343's

Any truth to that and would that tire setup work for my f06?
What are the width and offsets of the M5 601 wheel? I would assume it’s the same as M5 343?
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      03-18-2018, 07:03 AM   #44
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Originally Posted by upstate650 View Post
What are the width and offsets of the M5 601 wheel? I would assume it’s the same as M5 343?
Aftwr doing some research I found the answer. Since they are coming off a M5 the fronts are 9" and rears are 10" Front : ET 32 ; Rear ET 34

I believe it will fit the 650i Gran Coupe nicely. I'll have to do something with my spacers now
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