[streborx]

Originally Posted by fastdj88

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

Or inexpensive.

[fastdj88]

Originally Posted by streborx

Or inexpensive.

No joke. I guess worst-case when I get tired of making the swaps from winter/summer,/winter, I can put AS on my 21" winter rims and sell the 22" or store them indefinitely.

[streborx]

Originally Posted by fastdj88

No joke. I guess worst-case when I get tired of making the swaps from winter/summer,/winter, I can put AS on my 21" winter rims and sell the 22" or store them indefinitely.

Fortunately, I'm not obsessed with the look of 22" wheels and skinny sidewall tires. I'm transitioning to 20" and mounting 275/55R20's all the way around for ride comfort, vast tire selection, non run flat, tire price and tire availability. The circumference difference is less than 0.5% from OE. My set of 22"s will be mothballed until I sell my car.

[themama]

[QUOTE=Orient330iNYC;29409824]not needed, that setting is for the tire pressure recommended pressure settings.

you are correct . Thank you for pointing out.

[Angelo_GraysonMiniBMW]

Originally Posted by streborx

Fortunately, I'm not obsessed with the look of 22" wheels and skinny sidewall tires. I'm transitioning to 20" and mounting 275/55R20's all the way around for ride comfort, vast tire selection, non run flat, tire price and tire availability. The circumference difference is less than 0.5% from OE. My set of 22"s will be mothballed until I sell my car.

Please, Post up some pics when you get them on

[MystroX5]

Originally Posted by Angelo1

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.

I am putting my 21”ers back on this weekend. I honestly didn’t drive much on my 22” wheels this summer. I may just leave the 21”ers on all next year.
It’s not like the 21” wheels are small.

[streborx]

Originally Posted by Angelo1

Please, Post up some pics when you get them on

Will do - wheels are on order. Tires are in stock at DT. Hopefully will be done by end of month.

[Angelo_GraysonMiniBMW]

Originally Posted by MystroX5

I am putting my 21”ers back on this weekend. I honestly didn’t drive much on my 22” wheels this summer. I may just leave the 21”ers on all next year.
It’s not like the 21” wheels are small.

No kidding and now they are pushing 23” wheels. Now it will be necessary to buy the wheel and tire warranty. Those suckers will collapse in a pothole. Maybe if people would stop ordering bigger wheels, BMW might start offering more 20-21” wheels with better styling. It’s almost like they don’t want you to buy the smaller wheel.

[day2104]

Originally Posted by Angelo1

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

No offense taken, just make sure you consult with BMW and talk to them about your concerns. The OEM wheels when you buy are; front: 275/40 R22 and back: 315/35 R22. All I did was condense the width because of all-season tire reasons.

[Orient330iNYC]

Originally Posted by day2104

No offense taken, just make sure you consult with BMW and talk to them about your concerns. The OEM wheels when you buy are; front: 275/40 R22 and back: 315/35 R22. All I did was condense the width because of all-season tire reasons.

the width directly impacts the diameter and revs per mile.

the sidewall height is a product of the width and aspect ratio.

stock:
275/40-22: 275 * 0.40 = 110.00mm
315/30-22: 315 * 0.35 = 110.25mm

your setup:

275/40-22: 275 * 0.40 = 110.00mm
295/40-22: 295 * 0.35 = 103.25mm

this translates into 12 more turns per mile. doesnt sound like much but...

assuming a lifespan of 40,000 miles, your rear axle is turning 480,000 times more than the front. thats being absorbed by the wet clutches in the transfer case slipping.

its probably more than that as the rear tires typically wear twice as fast as the front so that difference actually will increase as the rear tires wear.

[streborx]

Originally Posted by day2104

No offense taken, just make sure you consult with BMW and talk to them about your concerns. The OEM wheels when you buy are; front: 275/40 R22 and back: 315/35 R22. All I did was condense the width because of all-season tire reasons.

Most people don't understand the way tires are dimensioned (forgive me if you do and have already done the calculations). (BTW, the dimension spec must have been done by an international standards committee who decided in fairness, a tire specification had to be partially metric, partially imperial, and to be impartial, the third dimension had to be in percent.)

What is special about the OE configuration -- 275/40 and 315/35 -- is that both tires have exactly the same circumference, and therefore have the same number of revolutions per mile. Deviating to 295/35 takes away 20mm of width (3/4"), but because of the screwy dimension standard, it also reduces the diameter by 14mm (~1/2"), reduces the circumference by 44mm (1.7"), and increases the revolutions/mile by 12 (almost 2%).

Check out the tire calculator at www.wheel-size.com/calc/ for a visual side-by-side comparison of any two wheel/tire combinations.

[Angelo_GraysonMiniBMW]

Originally Posted by day2104

No offense taken, just make sure you consult with BMW and talk to them about your concerns. The OEM wheels when you buy are; front: 275/40 R22 and back: 315/35 R22. All I did was condense the width because of all-season tire reasons.

What are you talking about? BMW oem are the same circumference

[day2104]

Please forgive my ignorance, and thanks for clarifying and educating. I received my information and suggestion from a reputable dealer and they said it would not mess up the longevity of the vehicle and if you wanted all-seasons, go squared look or this offset configuration. #Angelo1 you're right.

[PinkNinja400Guy]

Originally Posted by day2104

Please forgive my ignorance, and thanks for clarifying and educating. I received my information and suggestion from a reputable dealer and they said it would not mess up the longevity of the vehicle and if you wanted all-seasons, go squared look or this offset configuration. #Angelo1 you're right.

Angelo1 is right but he's not talking about your setup. Your setup is questionable.

The BMW OEM tires are 275/40 and 315/35, which are the same diameter (as Angelo1 said).

When you reduce the rear width to 295 but keep the 35 aspect ratio, that tire ends up being a smaller diameter. Orient330 did all the math for you to show that you have a very substantial ~2% difference in diameter and circumference.

You *might* be able to get away with that and not have any issues. Especially if you're leasing and you're rich enough to not care if stuff does go wrong. The system can handle small differences, but 2% seems to be at or past the limit of what's considered acceptable (1% seems to be the consensus on the internet of what's acceptable, some BMWs actually come with just a bit over 1% difference from the factory, BMW doesn't seem to have very well defined guidelines published for what is acceptable and what's not). If you're planning on keeping your car for a while, I'd definitely recommend fixing your tire situation. For various xDrive BMW models, you will also find reports on the forums here of people who did aftermarket wheel setups which were not as mismatched as yours, yet they still had issues shortly afterwards and needed new transfer cases ($$$).

Many dealership service advisors have about as much mechanical/technical knowledge as a monkey... but some don't, so I'm not going to tell you that your SA is wrong. But if you don't have a reason to trust your SA, I'd recommend being cautious about heeding their advice on this. At least get their recommendation in writing and make sure that they'll cover xDrive issues which happen in the future - because if your transfer case blows up and you have this aftermarket setup with a 2% difference, BMW won't cover that under warranty (unless you have a great dealership/SA who *may* be able to get it through. But what's important is the other case: if your SA is not good, then you end up in the situation where you get bad advice now, and then later are screwed for warranty when your car breaks).

[ComingInHot]

Great info in the thread guys People thought I was crazy buying a fully loaded M50i with the downgraded (no price difference ) 21s but the ride is better and tire options are better. Maybe there might be more options now, I haven't looked it up, but when I looked at the selection for 22 tires when I was purchasing it was terrible and that scared me away from the 22s. Now there's a 23 option out there which is even more ridiculous… god speed to those guys/gals.

[day2104]

So the new questions which size would you choose for square look?

285/35R22

285/40R22

[streborx]

Originally Posted by day2104

So the new questions which size would you choose for square look?

285/35R22

285/40R22

I would stay with the front mounted OE size 275/40R22, but if 10mm of extra width is important to you, the 285/40 will keep you within 1% of OE, while the 285/35 deviates by 2.7% (referring to circumference and revs/mile). But I haven't reviewed tire choices in both sizes, or researched the compatibility of all 275/40's with 10.5" wheels.

[Orient330iNYC]

Originally Posted by day2104

So the new questions which size would you choose for square look?

285/35R22

285/40R22

285/40-22 should be fine.

5mm closer to the shock and 5mm closer to the fender is not going to come close to rubbing.

i wouldnt go down. less sidewall and you'll be putting mileage on the odometer 3% faster. travelling 1000 miles will clock in at 1030, etc etc. not a huge deal, but why

[mjr24]

We have Yokohama Parada Spec-X in 285-40-22 on fronts and rears (many had said they ran this square setup with no issues). They have been great. We ran those all last fall and winter. The car is still SUPER smooth.....I never ever worry about potholes, etc.

I used the OEM summers this last summer until we got them changed back to A/S tires last week (since it's starting to get cold here and because the summers are about used up). I won't switch again, probably...I will keep A/S on year-round. I just wanted to use up the summers before I made the switch permanent.

[Stailey]

Has anyone gone down to 285 35 R22?

Seems this option gives tons of tires at great costs.

I'm looking at going with a square setup soon with a set of custom offset wheels (plans to use spacers in the back to allow for precise fitment). That setup will allow me to rotate the wheels for better treadle.

If dropping down to a 29.9 overall diameter, 696 Rev per mile doesn't throw off any electronics... I'm rolling with that.

Here's the tire I'm thinking is prefect:
https://m.tirerack.com/tires/tires.j...835WR2DWS06PXL

Would like y'alls feedback!

[jdloyd01]

Originally Posted by Stailey

Has anyone gone down to 285 35 R22?

Seems this option gives tons of tires at great costs.

I'm looking at going with a square setup soon with a set of custom offset wheels (plans to use spacers in the back to allow for precise fitment). That setup will allow me to rotate the wheels for better treadle.

If dropping down to a 29.9 overall diameter, 696 Rev per mile doesn't throw off any electronics... I'm rolling with that.

Here's the tire I'm thinking is prefect:
https://m.tirerack.com/tires/tires.j...835WR2DWS06PXL

Would like y'alls feedback!

I think your biggest issue is going to be the speedometer. If you have a 23, there are not a lot of options in the tire settings. I had to go with the settings for a 21 inch wheel with my tires (285/40ZR22). It's close enough. It might be close enough for you as well. Other than that, I wouldn't think you would have any issues with a 35.

[streborx]

Originally Posted by Stailey

Has anyone gone down to 285 35 R22?

Seems this option gives tons of tires at great costs.

I'm looking at going with a square setup soon with a set of custom offset wheels (plans to use spacers in the back to allow for precise fitment). That setup will allow me to rotate the wheels for better treadle.

If dropping down to a 29.9 overall diameter, 696 Rev per mile doesn't throw off any electronics... I'm rolling with that.

Here's the tire I'm thinking is prefect:
https://m.tirerack.com/tires/tires.j...835WR2DWS06PXL

Would like y'alls feedback!

If "precise fitment" is important to you, why not stick wth the OE 275/40R22 tire size? This eliminates the speedo odo error. 10mm of tire width and sidewall height just isn't that visually discernable.