spigot advice please help

Post Fri Jul 12, 2013 10:41 pm

guy i had spigots fitted but i believe they are the wrong size. what do u reckon on the way they sit

Post Fri Jul 12, 2013 11:10 pm

Doesn't really matter all too much. Spigot rings are only to help locate the wheel for attachment, they do nothing to keep it on the car. As long as the wheel is sat against the hub nicely, that's all that matters.

Post Fri Jul 12, 2013 11:15 pm

Disagree...
They're there to "Centralise" the wheel on the hub, to stop it running out of centre.

Post Sat Jul 13, 2013 10:06 am

How is a piece of nylon meant to centralise a + 5kg wheel and tyre combination spinning at roughly 1100rpm doing 70mph with a single load area?

The conical taper of the bolts and wheel indicates that the wheels are designed to be lug centered and therefore the spigot has no faring on alignment of the wheel.

Willnz, if they had to be that accurate, then your wheels would be a press fit.

Post Sat Jul 13, 2013 11:01 am

Whatever it does, it makes the wheel sit on the hub, rather than just hang on with the bolts.

If you're fitting a wheel, which has a wider central bore, than the hub of your car, then you need these rings. Simples.

P.S. The ring in the picture looks fooked.

Post Sat Jul 13, 2013 2:43 pm

The wheel is held on by the friction created between the back face of the wheel and the flange of the brake disc, through that of the hub flange and back of the brake disc due to the pressure applied by the wheel bolts.

As I said above, the wheels would have to be a press fit if they were held entirely by the spigot.

An interesting point to note from this is that you shouldn't grease the hub flange when you put new discs on, and you shouldn't grease the brake disc flange to stop the wheel getting stuck to it, as grease reduces the amount of friction considerably.

Post Sat Jul 13, 2013 4:57 pm

tbh i would say the vibration has been cured by 90% there is a slight wobble but i think that is common for 17s.

does anyone know a place where i can take my car too and get the exact size

Post Sat Jul 13, 2013 6:18 pm

capnmchl wrote:How is a piece of nylon meant to centralise a + 5kg wheel and tyre combination spinning at roughly 1100rpm doing 70mph with a single load area?

The conical taper of the bolts and wheel indicates that the wheels are designed to be lug centered and therefore the spigot has no faring on alignment of the wheel.

Willnz, if they had to be that accurate, then your wheels would be a press fit.

Wrong.
The spigots help to "Centralise" the wheel onto the hib.
If you use only the bolts, they are not a guarantee'd centralising bolt.

Ameet,Ebay.
All you need to know is the size of the wheel centrebore to 57.1 E30 hub size.

Post Sat Jul 13, 2013 6:28 pm

i have azevs 17inch will the centre bore be the same or will i have to measure it

Post Sat Jul 13, 2013 6:32 pm

Measure the centrebore Ameet.

Post Sat Jul 13, 2013 9:41 pm

capnmchl wrote: An interesting point to note from this is that you shouldn't grease the hub flange when you put new discs on, and you shouldn't grease the brake disc flange to stop the wheel getting stuck to it, as grease reduces the amount of friction considerably.

You shouldn't grease the mating surfaces of the disc or wheel because they need to be absolutely clean and flat in order to keep the disc/wheel running true. Any grease packed between them will (however slight) cause the disc or wheel to not sit flush/true on its mating surface. This may be enough to cause wheel wobble or brake vibration.
For the same reason, the hub should be wire brushed and cleaned to remove any build up of rust or brake dust before refitting the disc.

Post Sat Jul 13, 2013 11:52 pm

capnmchl wrote:The wheel is held on by the friction created between the back face of the wheel and the flange of the brake disc, through that of the hub flange and back of the brake disc due to the pressure applied by the wheel bolts.

As I said above, the wheels would have to be a press fit if they were held entirely by the spigot.

An interesting point to note from this is that you shouldn't grease the hub flange when you put new discs on, and you shouldn't grease the brake disc flange to stop the wheel getting stuck to it, as grease reduces the amount of friction considerably.

PLEASE< Give Up if you hane on real input..

Post Wed Nov 13, 2013 10:23 pm

http://www.e30zone.net/modules.php?name ... 59#2681159
My experience and collection of brain farts..

Post Wed Nov 13, 2013 10:38 pm

Correctly fitting spigots are a good thing for sure.

They don't carry the load of the wheel though, they're to centralise the wheel until the bolts are clamped up tight.

In theory, if you could get the wheel perfectly centered, and tighten up the bolts the there would be no difference with or without a spigot. However, that's pretty tricky to do, and the wheel would only need to be a fraction off to put the whole mass out of balance enough to cause a wobble or vibration.

If they were to actually carry the load of the wheel then they wouldn't be made of plastic

Post Wed Nov 13, 2013 10:48 pm

IF yes IF spigots were necessary why didn't bmw fit them as standard? If your fitting aftermarket wheels and having balancing problems then the wheels are the problem! Try getting them balanced ON the car.

Post Wed Nov 13, 2013 10:57 pm

Bmw dont fit them because the wheels are made to the correct diameter for the hubs! they have the 'spigot' built in as part of the wheel!

the exception is the e39, which uses a wider hub for some reason, so to put e39 wheel on any other 5 stud bmw you have to use adapter rings to stop them wobbling. of couse, bmw would never reccomend you do this.

aftermarket wheels usually need them because theyre drilled to a specific pcd, and a universal centre bore, which is then sized to a specific car with the correct spigot rings.

a selection of different size bits of plastic are a lot cheaper than custom machining every single set of wheels you sell to order.

off the top of my head, bmw, vw, vauxhall, rover, mazda and renault have all used 4x100 pcd wheels at some point, and of those, only vw and bmw have used the same centre bore. even the bmw mini uses a smaller hub than the 4x100 e30!

Post Thu Nov 14, 2013 6:08 am

scallyally wrote:IF yes IF spigots were necessary why didn't bmw fit them as standard? If your fitting aftermarket wheels and having balancing problems then the wheels are the problem! Try getting them balanced ON the car.

Erm, point one I don't understand - see above poster's comment. Two, My wheels (see the link to my thread) had vibrations, NOT a balancing issue, solved by fitting them correctly with the help of spigot spacers. Finally,
how the hell would you balance them ON the car?!?! I think you'rre feeding / been fedsomee prettyy duff info chap. My example shows how and why they can work as intended, case closed Nancy Drew...

hope this info is useful for the future.

Post Thu Nov 14, 2013 8:36 am

Any good quality tyre shop can balance wheels ON the car, it will take into account any imbalance in the disc,hub or drum. High performance cars will have this done and whilst our turds are far removed from this it may help if your having problems

The downside to this is that once done the wheel must remain in situ and not 'swopped'

Only trying to help, love Nancy.