[CnSky]

Good point Pete maybe deeper would work. I run 15s all round and it definitely solves the problem and looks better. Win win!!

[Frenchstar-57]

Originally Posted by HighlandPete

So what are new discs telling you as an engineer? For me, it indicates there is the possibility of a poor original hub to wheel mount. I wonder if there was axial run-out on the disc bell/hat face ahead of fitting new discs.

Remember BMW wheels are hub-centric, the bolt holes should not have any part in accurately mounting wheels. I'm still interested in the actual hub spigot to wheel centre clearance, it should only be 0.1 - 0.15mm. Any chance you can check your setup?

I see how the wheel alignment pins and friction discs help an accurate wheel mounting, but something changed in the mounting of your rear wheels, when the discs were changed.... was it simply just a better mounting, or did the hub run to a tighter tolerance (zero axial run-out) with new discs?

As you can see on there vernier caliper, i measured the wheel bore -> 66,74 - 66,76 mm, i had to cut my caliper with a grinder to enter it on the wheel
The hub spigot measure 66,5 mm
0,24mm - 0,26 mm difference between wheel and spigot

[Frenchstar-57]

Originally Posted by Frenchstar-57

As you can see on there vernier caliper, i measured the wheel bore -> 66,74 - 66,76 mm, i had to cut my caliper with a grinder to enter it on the wheel
The hub spigot measure 66,5 mm
0,24mm - 0,26 mm difference between wheel and spigot

NOTA : this is a manual measure with a vernier caliper, i can affirm that the wheel bore measure at least 66,7mm

[HighlandPete]

Originally Posted by Frenchstar-57

As you can see on there vernier caliper, i measured the wheel bore -> 66,74 - 66,76 mm, i had to cut my caliper with a grinder to enter it on the wheel
The hub spigot measure 66,5 mm
0,24mm - 0,26 mm difference between wheel and spigot

Explains so much. Outside of the tolerance figures BMW are using in their data for similar wheel vibrations.

F10 example for similar wheel vibrations...

Note: Play at the wheel hub greater than or equal to 0.15 mm is outside the permissible tolerance

(I'll see if I can find any confirmation for the G30)

Becoming even clearer why mounting accuracy is more critical than a simple "just put the wheel on" fit.

[Haradrim]

Originally Posted by Frenchstar-57

As you can see on there vernier caliper, i measured the wheel bore -> 66,74 - 66,76 mm, i had to cut my caliper with a grinder to enter it on the wheel
The hub spigot measure 66,5 mm
0,24mm - 0,26 mm difference between wheel and spigot

I think this is the answer of everything.. Tolerance is higher than bmw's limit. And makes inevitable vibrations.

[Frenchstar-57]

Originally Posted by Haradrim

I think this is the answer of everything.. Tolerance is higher than bmw's limit. And makes inevitable vibrations.

I think it is a combination of higher tolerance and poor contact zone
this explain why it vibrate a lot in highway curve.
with spacers, the contact zone seems to be better between wheel and spacer spigot, and between spacer and hub spigot

[G30@0690]

My 530i M Sport has 18 inch 662 M alloy wheels with staggered tyre set up.
I have noticed faint but discernible vibrations on speeds of around 120-140 kmph.
Any other members who have had a similar issue?

[Haradrim]

Originally Posted by G30@0690

My 530i M Sport has 18 inch 662 M alloy wheels with staggered tyre set up.
I have noticed faint but discernible vibrations on speeds of around 120-140 kmph.
Any other members who have had a similar issue?

Hello, even many of g30's have a chronical issues, you can first start with checking tyre pressures, balance, rims and tyres. After there may be chronical wheel hub clearance issue which is solved by frictional discs.

[Haradrim]

Update, mounted discs on fronts. But still slighr vibrate. I am not sure the tyre guy success about centering and tyre pressures. Will try anothet tyre shop today

[HighlandPete]

Originally Posted by Haradrim

Update, mounted discs on fronts. But still slight vibrate. I am not sure the tyre guy success about centering and tyre pressures. Will try another tyre shop today

You may still need to tape the hub spigot if the clearance is outside tolerance. Ensure there is a precise hub-centric fit.

[Frenchstar-57]

Originally Posted by HighlandPete

You may still need to tape the hub spigot if the clearance is outside tolerance. Ensure there is a precise hub-centric fit.

Hello, i confirm you that tape the tape in the hub is necessary, just one layer, and it must be homogeneous !
When i installed my new spacer, the spacer bore measured 66,6 and no play with the hub spigot of the car
however, before installing the wheel, i putted the spacer in the wheel and i could move the spacer into the wheel bore by my hand, because of the high tolerance.
So i put one layer of tape around the spacer spigot, then i putted the spacer into the wheel, it fit perfectly, no play and perfect centering (checked with feeler gauge) and then i installed the wheel, (with the spacer inside).
the results are concluants, no vibrations, just a short vibration at the speed of 140km/h but because i noticed it.
during this test, i doesn't used the mounting shaft and the frictions discs and the results are the same

[Return_of_Bimmer]

i've recently installed the friction discs and taped the spigot. No vibration at all and the ride is smoother than ever! Cudos to this forum and all those contributed to this solution.

[Haradrim]

Oh man, i forgot the tape spigots

Will make them soon and report

[Frenchstar-57]

Originally Posted by Haradrim

Oh man, i forgot the tape spigots

Will make them soon and report

Centering the wheel is the most important, and for me, the best way is the tape, just one layer, no overlap !
and you have to enter the wheel parallel to the hub, by using shaft for example

[Frenchstar-57]

Originally Posted by Frenchstar-57

Centering the wheel is the most important, and for me, the best way is the tape, just one layer, no overlap !
and you have to enter the wheel parallel to the hub, by using shaft for example

add grease in the wheel bore, it will be easier and prevent for damaging the tape during the insertion

[cap_konnius]

Hello gents, much apologies for taking such a long time to respond to everyone.

*Survived the BMW hitman, good thing I'm armed*

I have sent a reply with the detailed communication with the German dealer attached to 3 guys who asked for it by e-mail. Anybody else just let me know.

[cap_konnius]

Originally Posted by CnSky

FrenchStar no offence but I would prefer to hear what happened from Cap koonius.

Cap konnius can you tell us more please.

Originally Posted by Frenchstar-57

Thank you for your feedback, it's very interesting, i think that they replaced the rear axle mount with the 7 series model (for example) that are hydraulic rear axle mounts instead of the 5 series that are rubber mount. and finally theses new mount could absorb the vibrations.

It is funny because some six months after the fix they are still not willing to tell me what they used. Everything's in the mail.
What French here says is what my friend said as well - expect them to have used parts from a higher end model.

[Haradrim]

Originally Posted by Frenchstar-57

Hello, i confirm you that tape the tape in the hub is necessary, just one layer, and it must be homogeneous !
When i installed my new spacer, the spacer bore measured 66,6 and no play with the hub spigot of the car
however, before installing the wheel, i putted the spacer in the wheel and i could move the spacer into the wheel bore by my hand, because of the high tolerance.
So i put one layer of tape around the spacer spigot, then i putted the spacer into the wheel, it fit perfectly, no play and perfect centering (checked with feeler gauge) and then i installed the wheel, (with the spacer inside).
the results are concluants, no vibrations, just a short vibration at the speed of 140km/h but because i noticed it.
during this test, i doesn't used the mounting shaft and the frictions discs and the results are the same

Thank you, what kind of tape should i use?

[Frenchstar-57]

Originally Posted by Haradrim

Thank you, what kind of tape should i use?

One layer of 0,1 mm aluminum tape

[CnSky]

Originally Posted by cap_konnius

Hello gents, much apologies for taking such a long time to respond to everyone.

*Survived the BMW hitman, good thing I'm armed*

I have sent a reply with the detailed communication with the German dealer attached to 3 guys who asked for it by e-mail. Anybody else just let me know.

Thanks Cap got your email.

Very interesting that your dealer admitted they know it's a problem on the G30.

[Haradrim]

Originally Posted by CnSky

Thanks Cap got your email.

Very interesting that your dealer admitted they know it's a problem on the G30.

Can you also forward mail to me

alpersabuncu1@gmail.com

[cap_konnius]

Originally Posted by CnSky

Thanks Cap got your email.

Very interesting that your dealer admitted they know it's a problem on the G30.

Indeed. The German dealer mentioned they had 5 or more cars with the issue. Well I guess I was lucky, purchasing the car so close to its birthplace in Munich.
My current local dealer in Prague, Czech Republic, admitted it only after it was fixed by somebody else = they don't have to deal with it.

Originally Posted by Haradrim

Can you also forward mail to me

alpersabuncu1@gmail.com

Sent, my friend.