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Swaying/Floating/Rear wheel steering after new rear tyre change
22-08-2017, 01:02 PM
Post: #1
Swaying/Floating/Rear wheel steering after new rear tyre change
Afternoon Everyone,

Maybe someone can shed some light. Fit brand new Pilot Sport 3 tyres at the rear of my 323i M Sport. Car is now SIGNIFICANTLY worse to the point of scary Sad . At speeds above 90Kph car feels floaty at the rear and the faster you go it starts to feel like the rear is steering...whether moving straight ahead or mid-corner it feels like the backend is not part of the car and has a directional mind of its own. The old tyres were down the very minimum, but NEVER EVER did the car exhibit any such behaviour, now I can't out-corner a 4x4 bakkie Sad . Fitment centre said they inflated to 230kpa (will verify pressures after work), max pressure is marked at 340Kpa. I can also see the 'outside' makers so they've been fitted the right way. Have never experienced this on any car before post tyre change, any ideas?

Cheers Thumbs

Current;
2014 F30 320i M Sport
2001 E46 330Ci Coupe (best car ever!!)
2002 E65 745i (best car when it works properly!!)

Exes;
2010 E90 323I M Sport
1996 E36 328i Coupe M Sport
2001 E39 530i
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22-08-2017, 01:05 PM
Post: #2
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Rear shocks maybe?

Did you maybe change from RFT to non RFT?

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22-08-2017, 01:08 PM
Post: #3
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
I have the same issue on my E60, increasing the tire pressure does help bud, give it a try.

I running 2.4 Front / 2.8 Rear, seems to OK, but not perfect.
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22-08-2017, 01:08 PM
Post: #4
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
did you do your alignment after the change?? they could have pulled the rear alignment out if they tried to make the wheelnuts Tarzan-tight.
I remember having a similar issue after changing rear tyres on my 1er. alignment sorted it out.

Current:
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22-08-2017, 01:18 PM
Post: #5
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
When did you fit these tyres, you need to drive on them for 800+ km before you can even think of planting that right foot. Changed mine a month ago and almost didnt make a corner here on the Garden Route N2 highway here in Mosselbay. Car was floaty like a boat that first tank and a half, I couldnt even steer properly as it felt if the car was going straight instead of turning. It is when I investigated if there was a brake in process for new tyres, and sure as heck there is Skit

Have them redo the balancing and alignment of the rear wheels, oh I went from RFT to non RFT Tiptoe

Current: 2005 E90 330i manual - Black Sapphire Metallic (475)

Ex's:
1994 - E36 316i modified
2001 - E46 330i auto

[Image: 330i fuel consumption_3194366856.jpg]
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Steph745
22-08-2017, 01:59 PM
Post: #6
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Shocks mate, i got the same problem.

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His : Alpine White 335i Msports Pack(Manuaaaaal)
Her's : Audi A4 B8 1.8T Ambition

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2007 Ford Focus ST
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22-08-2017, 02:49 PM
Post: #7
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
I have zero suspension issues on the car, like I said, car was rock-solid stability wise and I could throw the car into corners no problem. It was just time to change the tyres. I did not do a wheel alignment but the wheels were balanced.
My fronts are non-RFT (Yoko AD08), the PS3s are RFT. I never went through this on the Yokos, so it is a bit disconcerting. Will have to read up on the tyre break-in process, I only fit them this passed Saturday. But surely changing a tyre can't throw off wheel alignment that badly? Does that mean if you get a flat and change your tyre roadside the car will no longer perform?

Current;
2014 F30 320i M Sport
2001 E46 330Ci Coupe (best car ever!!)
2002 E65 745i (best car when it works properly!!)

Exes;
2010 E90 323I M Sport
1996 E36 328i Coupe M Sport
2001 E39 530i
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22-08-2017, 03:15 PM
Post: #8
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
I reckon you do the alignment and check from there... it'll be the cheapest diagnosis and your car will be better off either way.

YOU probably won't pull your alignment skew when YOU put your wheel on after changing a flat, but I've seen SupaQuik guys standing on the wheel spanner to tighten/loosen a lug nut... that might cock up your alignment. Like I said, it happened to me on my 1er... did the alignment and it was sorted out.

tyres need to be run in a bit, but that doesn't cause that "floating" feeling... out-of-spec wheel alignment does.

Current:
'10 E90 320d LCI MSport
'04 e46 M3 vert M/T Phoenix Yellow/kiwi - The Beast
Ex:
'98 e36 318is M/T
'09 e86 Z4 Coupe 3.0Si A/T
'07 e87 120i M/T
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Steph745
22-08-2017, 03:54 PM (This post was last modified: 22-08-2017 03:56 PM by Lizzard.)
Post: #9
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
OP, I see you are referring to having mixed tyres, NON RFT front and with RFT rears. People have been advised to try and stay clear of this as it can cause the sensation of your car doing weird things, is also the reason why I went all NON RFT on mine as I only had to do the rears and the fronts was still fine.

I think it is wheel balancing that is out and making the car feel weird. Let them or another shop redo the wheel balancing. I did it as I couldnt do more than 80km/h and my car was shaking the whole place full. I ended up going back to the shop and told them to redo the work, sure the employee who did my tyres did a miss calculation and balanced my wheels (this is after it was balanced) 65 - 170 out. That is huge!!! Employee error I was told and it was fixed. Car no longer floated.

But maybe read up also on the mixed RFT with NON RFT combined. People are advised against this. And here is the info for the tyre break in https://www.tirerack.com/tires/tiretech/...p?techid=5

Current: 2005 E90 330i manual - Black Sapphire Metallic (475)

Ex's:
1994 - E36 316i modified
2001 - E46 330i auto

[Image: 330i fuel consumption_3194366856.jpg]
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Steph745
22-08-2017, 04:32 PM
Post: #10
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Thanks guys will do a wheel alignment this weekend to rule it out (or in...).

On the point about mixing non-RFT and RFTs I'd read the concerns, but I can tell you right now I've experienced NONE of the reported issues, I live on a hill drive a 13Km twisty hill ascent/decent to and from work everyday and that car has always been rock solid, and I really push it around those corners. I've had this mixed setup for the last 2 years or so. The only variable that has changed is the fitment of the new tyres, car had no issues prior.

Wheel balancing should only cause vibration issues at speed, and not the floaty wayward sensations, no?

The shop I used to fit the tyres (I always use them by the way) have a some machine thingy that they set a torque limit on for the wheel nuts, though I didn't see them do it. Maybe they did use a wheel spanner this time and over tightened? Iono

Thanks again guys for your responses Thumbs

Current;
2014 F30 320i M Sport
2001 E46 330Ci Coupe (best car ever!!)
2002 E65 745i (best car when it works properly!!)

Exes;
2010 E90 323I M Sport
1996 E36 328i Coupe M Sport
2001 E39 530i
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24-08-2017, 09:11 AM
Post: #11
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Morning,

So quick update, before my drive home last night checked pressures and saw an indicated 250Kpa, which I then increased to 320Kpa. Car was even worse! Mid-corner bumps triggered the DSC/DTC, never experienced that before. Got to the Engen by my place and dropped the pressures to 210Kpa and took another drive and the floatiness + plus rear wheel steer is almost all gone, both straight line and cornering. Will lower pressures a little more again (maybe 190-200) to see what happens, but now wondering why the car only feels normal at such low numbers. Maybe alignment will sort out the rest, but now thinking that maybe rear bushes/ball-joints are too squidgy to handle a new rock hard RFT tyre inflated to normal pressures...


Cheers Thumbs

Current;
2014 F30 320i M Sport
2001 E46 330Ci Coupe (best car ever!!)
2002 E65 745i (best car when it works properly!!)

Exes;
2010 E90 323I M Sport
1996 E36 328i Coupe M Sport
2001 E39 530i
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24-08-2017, 11:20 AM (This post was last modified: 24-08-2017 11:24 AM by Lizzard.)
Post: #12
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Never asked, what size tyre are we talking about here seeing that you only inflating them to 200kpa.

Mine is 18" staggered, 225x40x18 front with 240kpa and rears 255x35x18 with 260kpa Rollsmile Why I am asking is you are putting more tyre surface on the road by deflating them that low, which will give you more grip and stability but dont think it is good for the tyres. What does the door sill say about the tyre pressures you should use or the size you have on isnt in the door sill plate?

Current: 2005 E90 330i manual - Black Sapphire Metallic (475)

Ex's:
1994 - E36 316i modified
2001 - E46 330i auto

[Image: 330i fuel consumption_3194366856.jpg]
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24-08-2017, 06:41 PM
Post: #13
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
We're running the exactly same tyre setup. Only went that low to see the effect, increasing the pressures made things even worse!

Current;
2014 F30 320i M Sport
2001 E46 330Ci Coupe (best car ever!!)
2002 E65 745i (best car when it works properly!!)

Exes;
2010 E90 323I M Sport
1996 E36 328i Coupe M Sport
2001 E39 530i
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24-08-2017, 09:24 PM (This post was last modified: 24-08-2017 09:25 PM by Woodies.)
Post: #14
Swaying/Floating/Rear wheel steering after new rear tyre change
New tyres still to wear in might be effecting cornering grip, hence traction control kicking in. Other than suspension issues, have rear camber checked. Wheel alignment shop did me a 'favour' once and reduced rear camber because of rear inner tyre wear, car felt crap! BMW run quite a bit of rear camber, eats tyres, but grips in the corners. RFT will always be stiffer due to harder side wall that doesn't flex as much.


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Current - E46 2002 M3
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Steph745
25-08-2017, 09:17 AM
Post: #15
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Yeah I guess the next step is a suspension refresh. Oh well, guess it's about time.

Current;
2014 F30 320i M Sport
2001 E46 330Ci Coupe (best car ever!!)
2002 E65 745i (best car when it works properly!!)

Exes;
2010 E90 323I M Sport
1996 E36 328i Coupe M Sport
2001 E39 530i
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25-08-2017, 09:43 AM
Post: #16
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
had the same issue as you , when I replaced my Michelin PS3 with TOYO T1 at the back it felt like the back wants to overtake the front when cornering.
I however replaced the front as well with the TOYO T1 now everthing is fine.

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25-08-2017, 03:56 PM
Post: #17
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
Do yourself a favour and swop the front and rear wheels. I had this problem 30 years ago on my E12 535i when i put new Michelin TRX tires on the back. I was on my way to visit a friend about 200kms away so when i got to his place i swopped the front and rear wheels and problem was gone. Nowadays when i fit two new tires i always fit them on the front wheels (non staggered set up). Try this and see what happens! Normal tire pressures.
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04-09-2018, 12:52 PM
Post: #18
RE: Swaying/Floating/Rear wheel steering after new rear tyre change
(25-08-2017 09:17 AM)Steph745 Wrote:  Yeah I guess the next step is a suspension refresh. Oh well, guess it's about time.

hey Steph
did you solve the issue? i have the exact same problem. been going in circles trying to sort out this issue.

replaced both front rack ends, replaced all 4 tires twice, with Michelin sport 4, had multiple wheel alignments done and balancing. suspension is perfect and been check many time by different people all say the suspension is 100% but i still have this flouty issue.

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