[Mikej0h]

Originally Posted by Frenchstar-57

centering tool :83302459458

If you receive this kit, could you please measure the diameter of these studs?

I already have something that looks very much a-like (not bmw branded, https://amzn.eu/d/9245vTY), but would like to compare...

[Haradrim]

Originally Posted by Frenchstar-57

centering tool :83302459458

How does actually works? Fasten the wheel on hub, while mounting preventing any moves?

Any video you recommend?

[HighlandPete]

Originally Posted by Haradrim

How does actually works? Fasten the wheel on hub, while mounting preventing any moves?

Any video you recommend?

I'm questioning the precision possible, compared to ensuring a tight hub-centric mount. Positioning pins will require a very tight tolerance to the holes in the rim, or there is no gain.

The hole clearance for lug bolts is not a critical dimension, which requires a tight tolerance in manufacture, as the lug bolts clamp on the taper. Will hole size be reliable across rim production? Hub tolerance is the critical dimension for accurate mounting.

More important to me, I'd like to know what the rim to hub spigot clearance is in production examples, confirming (or not), the nominal 0.1mm (0.004") figure we see in hub/rim data.

[HighlandPete]

Originally Posted by Mikej0h

If you receive this kit, could you please measure the diameter of these studs?

I already have something that looks very much a-like (not bmw branded, https://amzn.eu/d/9245vTY), but would like to compare...

Link not working for me, to compare.

[Frenchstar-57]

Originally Posted by Mikej0h

If you receive this kit, could you please measure the diameter of these studs?

I already have something that looks very much a-like (not bmw branded, https://amzn.eu/d/9245vTY), but would like to compare...

Yes of course, i hope that it is more large and it will match the wheel holes size for more precision

[Frenchstar-57]

Originally Posted by G50

Would this not work on its own without the need for the friction disks?

My current G31 is vibration free, but my old G30 had vibrations with 2 different sets of wheels and tyres.

I was going to change the wheels on my current G31 to something more to my taste, however I don't want to risk gaining vibrations when currently I have none!

I don't know if only perfect wheel centering is enough....but if it helps to center the wheel easily with precision i think it's essential. i will test them

[Mikej0h]

Originally Posted by HighlandPete

Link not working for me, to compare.

Hopefully this works better: https://www.amazon.de/-/en/EBTOOLS-S.../dp/B08GG2PG6Z

[HighlandPete]

Originally Posted by Mikej0h

Hopefully this works better: https://www.amazon.de/-/en/EBTOOLS-S.../dp/B08GG2PG6Z

I use wheel alignment hangers similar to the one linked. Mine are simply 14mm bar with the M14 thread. Those linked also look to be made from 14mm bar.

Lug holes are ~16mm on my OE rims, so unless the shaft is precision matched to the hole diameter, the alignment tool will do nothing to help precision mounting.

[Mikej0h]

So, I may not have been clear...

I'm experiencing also these vibrations when i exchange my wheels. I already use those mounting studs. So while easier with mounting, it doesn't center them enough.

I'm really keen to know what the diameters are, so I can increase the thickness of the studs with aluminum tape, and see whether that would work as well... (Without buying another BMW specific tool &#128519

[HighlandPete]

Originally Posted by Mikej0h

So, I may not have been clear...

I'm experiencing also these vibrations when i exchange my wheels. I already use those mounting studs. So while easier with mounting, it doesn't center them enough.

I'm really keen to know what the diameters are, so I can increase the thickness of the studs with aluminum tape, and see whether that would work as well... (Without buying another BMW specific tool &#128519

Ah, see what you are trying to do.

If I was trying that method, I'd be taping the studs to be a very close fit to the wheel lug holes. To be honest I wouldn't try to centre the rim that way, I'd be closing the clearance on the hub/spigots.

I've not gone searching for machining dimensions and tolerances for BMW G30 rims. But have checked one of my winter wheels (OE for F10/11) and the holes are 16mm for M14 lug bolts. Not sure what manufacturing tolerance is allowed. Could be a very 'loose' tolerance as it is simply clearance.

[Frenchstar-57]

Originally Posted by HighlandPete

I'm questioning the precision possible, compared to ensuring a tight hub-centric mount. Positioning pins will require a very tight tolerance to the holes in the rim, or there is no gain.

The hole clearance for lug bolts is not a critical dimension, which requires a tight tolerance in manufacture, as the lug bolts clamp on the taper. Will hole size be reliable across rim production? Hub tolerance is the critical dimension for accurate mounting.

More important to me, I'd like to know what the rim to hub spigot clearance is in production examples, confirming (or not), the nominal 0.1mm (0.004") figure we see in hub/rim data.

I did a wax mould of the interior wheel bore, you can notice that the surface contact between hub and the wheel are special, like a line. you can compare between the wheel of my other Audi where the surface contact is more evident.

i measured the wax mould but this is not greater that 66.6 one the narrowest zone.

[Frenchstar-57]

The hub spigot stop about the black line on the picture
the diameter on the enter zone is greater that 66.6, but on the narrowest zone its okay, just the end of the spigot is maintained, maybe it is not enough.

[Haradrim]

Frenchstar-57
Hello, today made test drive for 120km distance. I have discs only on rear, the rear vibrations are almost gone but still some at rear but higher at front. Is front vibrations also reflects on rear a little?

[Frenchstar-57]

Originally Posted by Haradrim

Frenchstar-57
Hello, today made test drive for 120km distance. I have discs only on rear, the rear vibrations are almost gone but still some at rear but higher at front. Is front vibrations also reflects on rear a little?

When i installed the discs only in rear, the drive was not conclusive, i noticed more vibration from front, but all the car vibrated, yes i think that it was front vibrations reflected on rear. i can say that with 4 discs the difference of level vibration is huge, you have to install 4 discs.
before installing the disk make some scratch with sand paper on the brake disk surface contact zone, to increase friction between brake disc and friction disc. good centering, and 140NM bolts tighten. And it will be ok

[Haradrim]

Originally Posted by Frenchstar-57

When i installed the discs only in rear, the drive was not conclusive, i noticed more vibration from front, but all the car vibrated, yes i think that it was front vibrations reflected on rear. i can say that with 4 discs the difference of level vibration is huge, you have to install 4 discs.
before installing the disk make some scratch with sand paper on the brake disk surface contact zone, to increase friction between brake disc and friction disc. good centering, and 140NM bolts tighten. And it will be ok

Thank you man, i am very appreciated to all your helps to me on this journey

You have a friend at Turkey now.

[Frenchstar-57]

Originally Posted by Haradrim

Thank you man, i am very appreciated to all your helps to me on this journey

You have a friend at Turkey now.

You re welcome my friend, i think that the friction disc solution with perfect centering is a good compromise, these cars are, by design, very sensitives and i don't think we can do better without spend more money by doing big modifications (even if the car is under warranty)

[Haradrim]

Yes, i totally agree. If i didnt find this solution, my dealer about to change all differantial, shaft etc.

The 2 more disc, will be come Turkey at 1 months. While i am waiting i am trying to produce this item at my factory. Has anybody measured diameter of disc, center and holes?

[Frenchstar-57]

Originally Posted by HighlandPete

I use wheel alignment hangers similar to the one linked. Mine are simply 14mm bar with the M14 thread. Those linked also look to be made from 14mm bar.

Lug holes are ~16mm on my OE rims, so unless the shaft is precision matched to the hole diameter, the alignment tool will do nothing to help precision mounting.

The tools are 16mm diameter (i measured it), it fit perfectly the holes, i use them to center the wheel, it's easy , 4 friction discs + this tool helps me a lot ! i remember when my seat was a vibrator and now it's normal lol

[Haradrim]

Originally Posted by Frenchstar-57

The tools are 16mm diameter (i measured it), it fit perfectly the holes, i use them to center the wheel, it's easy , 4 friction discs + this tool helps me a lot ! i remember when my seat was a vibrator and now it's normal lol

So with this tool, you stack rim on hub perfectly and mount bolts one by one right?

[Frenchstar-57]

Originally Posted by Haradrim

So with this tool, you stack rim on hub perfectly and mount bolts one by one right?

Exactly, first Two bolts, then you remove the shafts one by one, replaced by bolts

[CnSky]

French star which tool did you buy? Link or part number please.

[Mikej0h]

Originally Posted by Frenchstar-57

centering tool :83302459458

^