[speedsterM340i]

Hello everyone I am trying to see if anyone has run into the problems I am currently having with my 2021 M340i non X-drive.

I bought a set of new tires, the car runs 225s unfortunately so I have skiny tires all around the vehicle. Anyways I just got all the tires replaced, same OEM tires that were on the car (Perelli P7 all season run flats) on 19in rims. I am having major issues now with the new tires which seem so weird to me. The car now sways side to side on the freeway when going around curves, it feel so unstable it feels like I am going to slide out. I am not going crazy speeds this is happening at 70mph+. So as you can imagine it just feels like the car is floating and is not planted to the floor.

In addition I also am coming across another issue, I will be on the freeway and I will go to pass a car and the traction control light comes on as if the wheels are spinning and cuts my power drastically on the freeway. I can be going 80mph, switching lanes in front of a car going slower and as soon as I punch and and start moving over it cuts all power. It just feels so dangerous driving this car on the freeway. What also is weird is I can do a pretty hard acceleration from a streetlight and not TC interference….

I have taken the car back to the tire shop and had them inspect everything was torque down to spec, Checked all the tire pressures, and have even increased the psi in the rear tires and nothing has helped! I also have driven the tires for 4 days now back and fourth to work in hopes that the weird swerving and “slipping” would go away as the tires scrubbed down.

I am such at a loss with this as there are no dash error codes popping up that would justify the shitty handling. I am taking the car to BMW today but would like some of yalls input, or if any of you have experienced this before.

Thanks again!

Update:

Thank you again so much for all your feedback!! It really means so much to me, I ended up taking the car to the BMW dealership with the concerns I had with the car. They are stating the car is 100% okay and that it is operating as it should be. They told me to document the issues with TC as they happen, as when accelerating from 60mph-100mph TC lights stays flashing. I am going to take y’all’s advice and get the car aligned as well from BMW.

[jg4c]

Odd behavior. Put at least a few hundred
miles on them and re-evaluate.

[Plimmie]

Just incase… you are running 225/40R19 right?

[speedsterM340i]

Originally Posted by Plimmie

Just incase… you are running 225/40R19 right?

Yes I am running 225/40r19

[Plimmie]

Was asking because Pirelli also sells the P7 in 225/45R19 (also a BMW OEM tire).
- spacers?
- ABS sensor defective?
- Alignment thrown off during tire change?

I’m sorry I couldn’t think of anything else that might cause this.

Curious as to what the solution is.

[bimmer456]

Odd it’s not staggered setup with 255 in the back.

[speedsterM340i]

Originally Posted by Plimmie

Was asking because Pirelli also sells the P7 in 225/45R19 (also a BMW OEM tire).
- spacers?
- ABS sensor defective?
- Alignment thrown off during tire change?

I’m sorry I couldn’t think of anything else that might cause this.

Curious as to what the solution is.

Thank you for your response, see I am stumped because I got the OEM tires that came with the car as my replacement set and wasn’t expecting any issues.

The car just got back from the BMW and they said everything is okay with the car… they said to record the issues while I am driving to help them try to replicate the issue precisely.

The car is not running any spacers, they said all wheel sensors including ABS and traction control system are okay. I asked them to do a alignment but they wanted to keep the car overnight so I will wait till next week. So the only two things it can be is the alignment or I have defective tires

[Dan B]

Take. It. Back. To. The. SHOP

[speedsterM340i]

Originally Posted by bimmer456

Odd it’s not staggered setup with 255 in the back.

I know kinda sucks tbh. I bought the car online from a BMW dealership in a different state and didn’t think to ask about the tire size since I thought the m340i would have the biggest set on there for the performance model 🤦‍♂️

[Shaneartistry]

I feel like my 2024 M340i is floaty on the interstate as well. There’s a couple threads where other folks share the same sentiment. Mine is RWD with the 225 square AS set up as well.

[Shaneartistry]

Forgot to mention, other folks who experienced “floaty” handling at highway speeds had one or several bent rims. Maybe a rim was bent when the new tires were installed?

[bimmer456]

I thought the x drive got the floaty suspension like f30

[zazzau]

Sounds too dangerous to even consider driving the car for more miles in hopes that the problem will go away. This is not normal. Take the car back to the tire shop and perhaps request for a different brand of tires. Have them triple check your rims as well.

[Onetotree]

I’ve been doing a lot of research on alignments recently and came across a lot of individuals on our platform that experienced twitchy handling even from factory. In the end, most found that their alignments were pretty off from the factory. They didn’t have enough toe-in, both front and rear, toe was not even, and some may have even had slight toe out. Since you bought yours used, it may have never been aligned after delivery from the factory. If your tires were worn, this may have muted the twitchyness by slipping instead of pulling in different directions. With new grippier tires and incorrect toe settings, you are probably now feeling the toe pulling in less than desirable directions. Hopefully an alignment solves your issues. Keep us updated!

[brianeck]

This car should feel on rails on the highway. It's stable as hell, smooth and quiet well past triple digit speeds. You could have a wheel balance issue (can be fixed with weights), an alignment issue, or a software issue where the car thinks it has a different size/set of wheels.

You should definitely invest in a high speed alignment and a redo on the tire mount/balance.

You should also check the menu in the car to input the correct tire spec/size - I'm not 100% sure how much impact that has on the actual driving dynamics but it's gotta do something. . . I have to put in my winter tires as a manual wheel/tire entry size when it detects the TPMS.

I'm coming off a MAJOR suspension issue from a pothole that I thought was just a minor alignment issue. . . I got used to a little minor vibration and float on the highway and now that the car is fixed again I can confidently tell you that it should feel like butter on the highway for sure if its all setup right.

[Shaneartistry]

Originally Posted by brianeck

This car should feel on rails on the highway. It's stable as hell, smooth and quiet well past triple digit speeds. You could have a wheel balance issue (can be fixed with weights), an alignment issue, or a software issue where the car thinks it has a different size/set of wheels.

You should definitely invest in a high speed alignment and a redo on the tire mount/balance.

You should also check the menu in the car to input the correct tire spec/size - I'm not 100% sure how much impact that has on the actual driving dynamics but it's gotta do something. . . I have to put in my winter tires as a manual wheel/tire entry size when it detects the TPMS.

I'm coming off a MAJOR suspension issue from a pothole that I thought was just a minor alignment issue. . . I got used to a little minor vibration and float on the highway and now that the car is fixed again I can confidently tell you that it should feel like butter on the highway for sure if its all setup right.

Good to know. Would you take it to a BMW dealership or a dedicated tire shop?

[jg4c]

Originally Posted by Shaneartistry

Good to know. Would you take it to a BMW dealership or a dedicated tire shop?

Neither one.

Try and find an independent shop with a
proper alignment rack and techs that know
how to do an alignment on cars like BMW’s.

You can also search this forum for the thread
that has some members posting alignment
specs, and you can take those to the shop
and show them what you’re looking for.

[Shaneartistry]

Originally Posted by jg4c

Neither one.

Try and find an independent shop with a
proper alignment rack and techs that know
how to do an alignment on cars like BMW’s.

You can also search this forum for the thread
that has some members posting alignment
specs, and you can take those to the shop
and show them what you’re looking for.

All the alignment print outs I saw were on 225/255 set up. Would it be the same for 225 squared or different? Thanks.

[jg4c]

Originally Posted by Shaneartistry

All the alignment print outs I saw were on 225/255 set up. Would it be the same for 225 squared or different? Thanks.

I’m no expert, but I’d think those alignment
targets are good for both square and staggered setups.

[oonowindoo]

I have had a few cars previously had similar feeling when i got new tires installed.
But after about 1000 miles, the car was back to normal. I guess some tires do have "break in" period.

Matter of fact, the first week of getting my new 2024 LCI, the car felt floaty and unstable at high speed. and now it feels OK. and i have 225 all around now :mad: can't wait to get rid of these and get some real summer tires (245 all around)

[frozen_b58]

I experienced what appears to sound like an uneven humming sound coming from my tires around 25mph. And was wondering if anyone in this thread has had a similar issue. All Weather Pirellis alignment and balance earlier this year. Noise can be described as road humming from the tires although it is noticeably inconsistent and sounds like *whirwhirwhirwhir instead of whiiiiiiiiiiiiiiiiiiiiiiiiiiir