NonRFT cause transfer case issues on F15

[Hacxman]

My 2016 X5 x35i m-sport came with staggered 20” Pirelli run-flats. We just replaced them a few months ago with non-RFT Michelin Pilot Sport 4S tires with the same sizes. We noticed some stuttering (or crabbing as it has been described here) when braking, cornering, and accelerating. At first I thought it was just a break in problem or the roads were still hard from early spring/late winter. We finally took it to BMW and they are convinced it is due to the tires not being run-flats. They said the weight of the vehicle is too much for the weaker sidewalls? When they unplugged the transfer case the problem stopped. They recommend I put RFT back on the car, which seems ridiculous since I just bought a brand new set. Are they just dodging the transfer case replacement? This is not the first time BMW has given me the run-around on warranty work.

[ems328i]

Originally Posted by Hacxman

My 2016 X5 x35i m-sport came with staggered 20” Pirelli run-flats. We just replaced them a few months ago with non-RFT Michelin Pilot Sport 4S tires with the same sizes. We noticed some stuttering (or crabbing as it has been described here) when braking, cornering, and accelerating. At first I thought it was just a break in problem or the roads were still hard from early spring/late winter. We finally took it to BMW and they are convinced it is due to the tires not being run-flats. They said the weight of the vehicle is too much for the weaker sidewalls? When they unplugged the transfer case the problem stopped. They recommend I put RFT back on the car, which seems ridiculous since I just bought a brand new set. Are they just dodging the transfer case replacement? This is not the first time BMW has given me the run-around on warranty work.

What is the weight rating of the specific tyre you have? I'm going to call BS, I have only ever had non-RFT's on my truck and not one single issue...

[RED_Y_]

I think majority of people here are using non-runflats as soon as they can, sounds like a BS excuse to me.

[turboawd]

As long as you have oem sizes, you should be ok.
How many miles you have? Under warranty it seems...
First thing I'd do is change the transfer case fluid. Which warranty won't do.

[Hacxman]

Car only has 25k miles and the tire rating is the same as stock.

[turboawd]

Take a tape measure and measure from ground to top of each tire. Are they all the same?

[201]

Considering you have low miles before you change out TC fluid a simple recalibration through ista might fix the issue

[NYBulldog]

Complete horse shit. As long as the sizing of the tires is correct there is no reason to put the blame on the non-RFT tires. Wrong sized tires will give you an issue whether they are non-RFT or Run Flats.

You have 20" wheels so that means they will be staggered. I hope you bought the correct tire specs. You should share them.
315/35-20 Equal Height 28.7" Width 12.4" Rim Width Range 20 x 10.5-12.5"
275/40-20 Equal Height 28.7" Width 10.8" Ridm Width Range 20 x 9-11"

[RED_Y_]

Originally Posted by NYBulldog

Complete horse shit. As long as the sizing of the tires is correct there is no reason to put the blame on the non-RFT tires. Wrong sized tires will give you an issue where they are non-RFT or Run Flats.

You have 20" wheels so that means they will be staggered. I hope you bought the correct tire specs. You should share them.
315/35-20 Equal Height 28.7" Width 12.4" Rim Width Range 20 x 10.5-12.5"
275/40-20 Equal Height 28.7" Width 10.8" Ridm Width Range 20 x 9-11"

I've seen few reports here when people run square 20'' set up and it works fine too.

[NYBulldog]

Originally Posted by RED_Y_

I've seen few reports here when people run square 20'' set up and it works fine too.

Of course, just made an assumption based on OEM 20" M Sport staggered wheels.

[Hacxman]

Originally Posted by NYBulldog

Complete horse shit. As long as the sizing of the tires is correct there is no reason to put the blame on the non-RFT tires. Wrong sized tires will give you an issue whether they are non-RFT or Run Flats.

You have 20" wheels so that means they will be staggered. I hope you bought the correct tire specs. You should share them.
315/35-20 Equal Height 28.7" Width 12.4" Rim Width Range 20 x 10.5-12.5"
275/40-20 Equal Height 28.7" Width 10.8" Ridm Width Range 20 x 9-11"

F: 275/40ZR20 (106Y)
Rim Width Range:9-11"
Measured Rim Width:9.5"
Section Width:10.9"
Tread Width:9.4"
Overall Diameter:28.7"

R: 315/35ZR20 (110Y)
Rim Width Range:10.5-12.5"
Measured Rim Width:11"
Section Width:12.6"
Tread Width:11.1"
Overall Diameter:28.7"

[Sophisticated Redneck]

Originally Posted by Hacxman

My 2016 X5 x35i m-sport came with staggered 20” Pirelli run-flats. We just replaced them a few months ago with non-RFT Michelin Pilot Sport 4S tires with the same sizes. We noticed some stuttering (or crabbing as it has been described here) when braking, cornering, and accelerating. At first I thought it was just a break in problem or the roads were still hard from early spring/late winter. We finally took it to BMW and they are convinced it is due to the tires not being run-flats. They said the weight of the vehicle is too much for the weaker sidewalls? When they unplugged the transfer case the problem stopped. They recommend I put RFT back on the car, which seems ridiculous since I just bought a brand new set. Are they just dodging the transfer case replacement? This is not the first time BMW has given me the run-around on warranty work.

I had recent experience with this, my staggered setup was causing the transfer case to do exactly what you described as even though on paper they were less then a tenth of an inch off in circumference, when I measured them they were way off. Basically it seems with some tire manufacturers the size is more of an suggestion then fact...

So grab a string and wrap it around the tread of your tires front and back and measure the difference. If within 1 percent then just change the oil in your transfer case and recalibrate within ISTA. BMW will try to convince you to replace it for 8 grand....change oil and recalibrate first, more often then not it will put it back In spec and work fine after.

[Bottled]

Arent you running too low pressure?
I had to increase the pressure all around for non RF 20" to be well behaving. (2,7 front; 2,2 back as i am running the car mostly empty)

Having those tyres for almost 50thou Kms as summer set and no issues at all.

[NYBulldog]

I agree with wrapping a string around the tread. Something sounds wrong. I've been messing around with Xi and xDrive staggered set up for years. I've tried just about every thing. I've also made many mistakes. So I've learned a whole lot. Check the actual diameter of the tires and the pressure as mentioned above. I will tell you that if you ever change wheels or tires and there is some funky interference... there is definitely something wrong there. What you should do is take it to a different dealership and make zero mention of the tire change. BUT take your measurements first. I bought brand new Michelins for my M3 and the diameter on the tires were different then the spec sheet just an FYI.

[Keithwand]

I switched to Continental DSW And so glad I did. Much quieter and better ride.
Did get a 6 inch piece of rebar and ruined that tire. Was insured so oh well.
No issues although mine is rear drive.

[rajindergill]

They are talking complete rubbish. The X5M (F85) has non-runflats on them as standard from the factory. Load ratings are 104 on the front which are 285 and 108 on the rear which are 325.

Challenge them on the F85 which the 21's are Michelin Pilot Sport 4S as standard and Pirelli P Zero on the 20 inch.

[TOPEC]

Originally Posted by rajindergill

They are talking complete rubbish. The X5M (F85) has non-runflats on them as standard from the factory. Load ratings are 104 on the front which are 285 and 108 on the rear which are 325.

Challenge them on the F85 which the 21's are Michelin Pilot Sport 4S as standard and Pirelli P Zero on the 20 inch.

Complete rubbish yes, but there is no point in challenging a dealer with that as they will simply say the F85 was calibrated/designed/specified to use non run flats where as the F15 was meant to use run flats thus its easy for them to just point a finger at the easiest stuff to deny warranty. If the F15 had an oem option of using non run flats then that would be a point to challenge the dealer with.

[XXX5]

Find anther dealer. This is bullsh*t!

[Qsilver7]

....so why are non run flat tires listed in the part database along with an emergency spare tire? If the weight of an f15 X5 is too great for regular tires...then it wouldn’t make sense for BMW to offer a spare and non run flats.

Continentals CST: https://bimmercat.com/bmw/en/search/...iX/USA/36_1795




Emergency spare: https://bimmercat.com/bmw/en/search/...iX/USA/36_1088

[EdgyE36]

The important thing here is load rating. It's dealer BS.

Just went to TR, and the load rating for those tires is XL. So they should work fine. Assuming you kept to 275/40 and 315/35.

• Rear: 315/35ZR20 (110Y) XL
• K1 Ferrari
• Style: Blackwall
• Eco Focus: Michelin Total Performance
• Load Range: XL
• Serv. Desc: (110Y)
• UTQG: 300 AA A

We went with Conti DWS and have had no issues.

[Hacxman]

So, I ended up having to replace one of the rear tires thanks to a screw. The shaking has reduced noticeably with the new tire (same model/size). Maybe it was just bad or incorrect spec tires as some have mentioned? Also, The rear tires seemed very sticky and would pull up all sorts of rocks and debris. So, it was no surprise it grabbed a screw. It almost sounded like studded snow tires pulling into the driveway. I have the same tires on another car (non-K1 Ferrarri model) and they don't do that.

[Keithwand]

I just reread this.
I have noticed a little crabbing or wobble at low speed.
Thought it might be from flat spot from parking and colder weather.
Only in the rear and not in the steering wheel.
Don’t notice it at freeway speeds.