[geewiss]

I know there are plenty of posts on this topic so I'm sorry to create another. I just haven't seen all this information in one place.

I have the 2022 BMW X7 40i Msport with the summer run flat tires. I'm looking to get all season tires to avoid having to switch each season. Don't care if they are run flat or not (I opted to buy the spare).

As everyone knows here are the stats.
275/40/22 Front 9.5 rim
315/35/22 Rear 10.5 rim

I've been unable to find the rear tire in an all season so I'm considering what I've seen some other members mention and that is to go with the 285/40/22 all around.

Here's my question. Per https://tiresize.com/calculator/ the original tires have 658 revolutions per mile and the non OEM size (285/40/22) will have 651 revs per mile. Granted I will have the 651 revs per mile all the way around. I'm just curious if this will trigger any electronic issues.....traction control, tpms, etc?


Thoughts? thanks!!!

[PinkNinja400Guy]

The other wheel option available from the factory for the X7 is 285/45 r21. That does 649 revs/mile.

[day2104]

I posted this on another thread, but I just bought these so I don't have to keep switching to summers and winters. AllSeason are not made for 315 tire so I went with the 295 and I wasn't sure if a 325 would fit right on a 10.5 rim.
front: Pirelli Scorpion Zero AllSeason 275/40 R22
back: Pirelli Scorpion Zero AllSeason 295/35 R22

[geewiss]

Originally Posted by PinkNinja400Guy

The other wheel option available from the factory for the X7 is 285/45 r21. That does 649 revs/mile.

I honestly feel like it shouldn't be an issue as long as all 4 corners have the same revolutions. But with today's electronics in automobiles, I have no idea if it would cause an issue.

I wonder if I was to have an issue and take it in for service would something like this even void my warranty??

It's just mind boggling to me that I cant find an all season tire in OEM sizes for my vehicle.

[geewiss]

Originally Posted by day2104

I posted this on another thread, but I just bought these so I don't have to keep switching to summers and winters. AllSeason are not made for 315 tire so I went with the 295 and I wasn't sure if a 325 would fit right on a 10.5 rim.
front: Pirelli Scorpion Zero AllSeason 275/40 R22
back: Pirelli Scorpion Zero AllSeason 295/35 R22

This setup scares me as you have quite a bit of difference in the revolutions per mile between your front and rear.

[NGT2]

This is the precise reason I passed on a lot of good X7's the last couple months. I finally found one that checked our boxes with 21" wheels.

It's amazing to me how many of these were spec'd with 22" wheels, knowing there is no all season option. There's no way they were all customer ordered. Maybe I'm wrong.

I might have taken the challenge in anyway, but my service dept said even when they find tires for 22" wheels, it may take weeks to get them. They've resorted to plugging tires in the meantime.

I know this isn't helpful. Sorry to hijack the thread. It's just a topic I've been researching and frustrated with for months.

[Orient330iNYC]

Originally Posted by geewiss

This setup scares me as you have quite a bit of difference in the revolutions per mile between your front and rear.

+1 that is going to put stress on the transfer case. thats on the edge of acceptable without any tire wear, the risk would be the transfer case failing and BMW will not cover it.

325 is out of spec for the rear width by 10mm. i asked tire rack, and while they could not officially endorse it, they knew of quite a few people running 325/35/22 on a 10.5 rim without issues.

the other option is 285 all around. its in spec for the front rims at 9.5 and rear at 10.5. i believe others have had good luck with 285/45/22 for a little more cushion and selection.

[geewiss]

Originally Posted by Orient330iNYC

+1 that is going to put stress on the transfer case. i would not personally run that much of a difference as you run the risk of the transfer case failing and BMW will not cover it.

325 is out of spec for the rear width by 10mm. i asked tire rack, and while they could not officially endorse it, they knew of quite a few people running 325/35/22 on a 10.5 rim without issues.

the other option is 285 all around. its in spec for the front rims at 9.5 and rear at 10.5

Yup, totally agree that the 285's all around would be no issue for the 9.5 or the 10.5 rims. I'm just wondering if there would be any issue with the difference in diameter between the 285's and the OEM's....as far as traction control, etc...

[M3JHWK]

So the OEM 21s with Bridgestones are at 671 RPM. I was looking at the Michelin Pilot Sport A/S 4s in 285/40-22 and they're also at 671 RPM. Seems like it would be a great choice and a great tire by the looks of it. I'm not sure if you'd need to change the tire settings in iDrive to reflect the change.

[BMW5and7]

Originally Posted by NGT2

This is the precise reason I passed on a lot of good X7's the last couple months. I finally found one that checked our boxes with 21" wheels.

It's amazing to me how many of these were spec'd with 22" wheels, knowing there is no all season option. There's no way they were all customer ordered. Maybe I'm wrong.

I might have taken the challenge in anyway, but my service dept said even when they find tires for 22" wheels, it may take weeks to get them. They've resorted to plugging tires in the meantime.

I know this isn't helpful. Sorry to hijack the thread. It's just a topic I've been researching and frustrated with for months.

I second that. I had one X7 in my garage at some point, and I wanted to add another X7 to the family for my wife. I didn't want to purchase another one brand new, so I kept looking for an older/used one that had already depreciated in price.

It took me exactly 10 months to find a fully loaded 2019 50i (original MSRP $120K) with 21inch wheels, finally! It's home now! All other options and years would either lack options, or would not have the 21 inch wheels.

To me, finding or paying more for tires is not the main motivation, but am super sensitive to ride quality, and having driven so many X7s (not all mine), I can easily feel the difference in ride quality between the 21 and 22 inch wheels. Diffenetly worth it for me.

[Orient330iNYC]

Originally Posted by geewiss

Yup, totally agree that the 285's all around would be no issue for the 9.5 or the 10.5 rims. I'm just wondering if there would be any issue with the difference in diameter between the 285's and the OEM's....as far as traction control, etc...

no, as long as its consistent front to back. traction control, abs, and stability are all looking at relative rotation.

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
275/40-22 4.3in 15.3in 30.7in 96.3in 658 0.0%
285/40-22 4.5in 15.5in 31.0in 97.3in 651 1.0%
285/45-21 5.0in 15.5in 31.1in 97.7in 649 1.4%

your speedometer and odometer will be 1% low.

stock 21" tire size is 285/45-21

[crackerjack15]

I have taller tires than stock, 285/40-22 and 325/35-22. No issues.

[streborx]

The worst case scenario would seem to be slapping the donut spare on, which makes 701 revs/mile against the others doing 658. The OM says not to exceed 50 mph, and that vehicle steering and braking are affected, but there's no distance limit spec'd. Anyone have experience with this?

[fastdj88]

Originally Posted by BMW5and7

I second that. I had one X7 in my garage at some point, and I wanted to add another X7 to the family for my wife. I didn't want to purchase another one brand new, so I kept looking for an older/used one that had already depreciated in price.

It took me exactly 10 months to find a fully loaded 2019 50i (original MSRP $120K) with 21inch wheels, finally! It's home now! All other options and years would either lack options, or would not have the 21 inch wheels.

To me, finding or paying more for tires is not the main motivation, but am super sensitive to ride quality, and having driven so many X7s (not all mine), I can easily feel the difference in ride quality between the 21 and 22 inch wheels. Diffenetly worth it for me.

I can understand this, but I loved the look of 22" so I just bought a 2nd set of rims/tires and will swap next month to 21" winter setup. I don't think A/S tires really have a place honestly, they sit in 'no man's land," in my opinion -- not really a performance tire, and not really a winter tire. I want my M60i on a performance tire in the summer personally.

[arciga18]

Originally Posted by fastdj88

I can understand this, but I loved the look of 22" so I just bought a 2nd set of rims/tires and will swap next month to 21" winter setup. I don't think A/S tires really have a place honestly, they sit in 'no man's land," in my opinion -- not really a performance tire, and not really a winter tire. I want my M60i on a performance tire in the summer personally.

I appreciate your enthusiasm for the 22. Yes, they can look better depending on the wheel design. Yet, BMW performance numbers posted on their website is based on 21" wheels/ tires.

[MystroX5]

Your best Draggy performance numbers will be on 21” AS tires. 22”/23” is all for show in the SUV world. Start doing some 22 to 21 wheel swaps for the season every year and your back will tell you the 22” rear tires are noticeably heavier.

[fastdj88]

Originally Posted by MystroX5

Your best Draggy performance numbers will be on 21” AS tires. 22”/23” is all for show in the SUV world. Start doing some 22 to 21 wheel swaps for the season every year and your back will tell you the 22” rear tires are noticeably heavier.

Haha, nobody said it's easy to look good.

[themama]

Originally Posted by geewiss

I know there are plenty of posts on this topic so I'm sorry to create another. I just haven't seen all this information in one place.

I have the 2022 BMW X7 40i Msport with the summer run flat tires. I'm looking to get all season tires to avoid having to switch each season. Don't care if they are run flat or not (I opted to buy the spare).

As everyone knows here are the stats.
275/40/22 Front 9.5 rim
315/35/22 Rear 10.5 rim

I've been unable to find the rear tire in an all season so I'm considering what I've seen some other members mention and that is to go with the 285/40/22 all around.

Here's my question. Per https://tiresize.com/calculator/ the original tires have 658 revolutions per mile and the non OEM size (285/40/22) will have 651 revs per mile. Granted I will have the 651 revs per mile all the way around. I'm just curious if this will trigger any electronic issues.....traction control, tpms, etc?


Thoughts? thanks!!!

There is a tire setting in the vehicle to select other wheels. Would there be a problem if you select the option and let the car calibrate the wheels?

[Angelo_GraysonMiniBMW]

Originally Posted by MystroX5

Your best Draggy performance numbers will be on 21” AS tires. 22”/23” is all for show in the SUV world. Start doing some 22 to 21 wheel swaps for the season every year and your back will tell you the 22” rear tires are noticeably heavier.

Absolutely agree. Anything over 18” is just diminishing on-road performance whether on a car or suv. But, a 21” wheel is so much better vs. the 22” wheel option in terms of comfort, performance and tire options. Once you own the 21” wheels, people will forget about the lessor styling when they start enjoying how nice the smaller wheels are. I test drove both and noticed immediately how much nicer the 21”s were, especially cornering.

[Orient330iNYC]

Originally Posted by streborx

The worst case scenario would seem to be slapping the donut spare on, which makes 701 revs/mile against the others doing 658. The OM says not to exceed 50 mph, and that vehicle steering and braking are affected, but there's no distance limit spec'd. Anyone have experience with this?

i did drive on a donut for an entire weekend, not on my g07. 400 miles, no problem
for a single tire, you'll have the axle's differential splitting the difference with to the transfer case.
so one axle will be at ~680 and the other will be at 658, roughly 3.4% (im guesstimating the math)

its higher than recommended, but even if you put 1000 miles on it, its nothing compared to a set mismatch thats on the car for the life of the tire. figure for an all season thats 30K miles of transfercase slipping.

[Angelo_GraysonMiniBMW]

Originally Posted by day2104

I posted this on another thread, but I just bought these so I don't have to keep switching to summers and winters. AllSeason are not made for 315 tire so I went with the 295 and I wasn't sure if a 325 would fit right on a 10.5 rim.
front: Pirelli Scorpion Zero AllSeason 275/40 R22
back: Pirelli Scorpion Zero AllSeason 295/35 R22

No offense but this is a terrible setup. You should never have different height tires on any vehicle. All tires should have equal revolutions.

[Orient330iNYC]

Originally Posted by themama

There is a tire setting in the vehicle to select other wheels. Would there be a problem if you select the option and let the car calibrate the wheels?

not needed, that setting is for the tire pressure recommended pressure settings.

that will not fix the problem with a mismatched set and too much rotation difference front to back.

a square setup wont cause issue with any of the systems. the only consequence will be the speedometer and odometer will be off by whatever % the revs per mile differ from stock.

a setup where the front to rear revs per mile difference is off will cause physical and electronics issues.

1) something is going to have to absorb the difference in rotations front to rear. and that is going to be the transfer case

2) DSC and abs are based on reading relative wheel speed differences (and other sensor inputs for dsc) being out of spec will likely make the system think the slower turning wheels are slipping to a degree when braking and the faster turning wheels are slipping when accelerating.