turnipfarmer
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| posted on 31/12/10 at 02:59 PM |
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Spigots & spacers
I've read a number of threads in this forum, but none of them seems to quite answer this question...
My wheels are going to need 20mm spacers. I understand that using universal ones could put a strain on the wheel bearings & may cause the wheels
to "hang on the bolt threads".
However, I don't fancy hubcentric spacer prices, so I was wondering whether if using spigot rings in conjunction with universal spacers would
achieve the same effect as hubcentric spacers? Wouldn't the load then be taken by the hubs in just the same way?
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MakeEverything
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| posted on 31/12/10 at 03:07 PM |
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As long as the spacer supports the rear of the wheel, and the studs are long enough to get enough nut on, then i dont see why the wheel hangs on the
bolt, as the spacer fits over the hub nut, and the wheel onto the spacer.
I agree that you may need longer studs as opposed to ferrule studs as they would be stronger and eliminate the risk of stripping the original stud
thread.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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snapper
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| posted on 31/12/10 at 03:39 PM |
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There is a spacer called hubcentric which has a machined spigot built in
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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MakeEverything
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| posted on 31/12/10 at 03:43 PM |
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quote:
Originally posted by snapper
There is a spacer called hubcentric which has a machined spigot built in
Oh i see what you mean now. I wouldnt bother with those. Just some universal ones and some longer studs would do.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Mark Allanson
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| posted on 31/12/10 at 03:48 PM |
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The universal ones have a special design feature that will shake your fillings out, marginally prior to knackering your balljoints. The hubcentric
ones are a bit more expensive but are really the only way to go.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Stott
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| posted on 31/12/10 at 03:51 PM |
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Spigot rings are only to adapt the inner of your chosen aftermarket wheel to your hub. Used in conjunction with 20mm plain spacers they wont have
anything to locate onto s the spacers are flat. Hubcentrics locate over your original hub protrusion then have their own machined protrusion to mirror
the original hub, picking up on the wheel centre, or spigot ring as the case may be.
You need to fork out for hubcentric spacers, or sell the wheels and buy ones of the correct offset.
My car can only take 5mm of plain spacer before the wheel is hung on the bolts so that gives you an idea oof how far you should go with plain ones.
ATB
Stott
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britishtrident
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| posted on 31/12/10 at 04:02 PM |
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These are the facts
The load transfer between the wheel and the face of the hub hub is friction alone.
The only way a wheel will "hang on the bolts" is if the wheel nuts/bolts are slack.
All spacers change the load on the wheel bearing by amount that depends only on the thickness of the spacer.
Form many years most manufacturers did no use hub centring because too many problems with wheels stuck on the hubs, the change came when
manufacturers switched to for cost reduction reasons wheel bolts, with wheel bolts the wheel is usually (but not always) hub centred because of the
difficult lining up the holes when changing a wheel.
Many many works racing and rally cars managed quite nicely over the years using the wheel nuts alone to centre the wheel.
Wheel centering will centre the wheel slightly more accurately (provided the wheel and hub centre are clean) but any run out of the wheel rim is
trivial when you consider the run out of a tyre.
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daviep
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| posted on 31/12/10 at 04:15 PM |
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I'm running 25mm spacers, seem fine to me over 2000miles.
Davie
“A truly great library contains something in it to offend everyone.”
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turnipfarmer
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| posted on 31/12/10 at 04:55 PM |
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Thanks for the replies so far.
I was trying to avoid universal spacers cos' I'm not convinced that slots allow you to centre the spacer with the necessary precision,
which might lead to balance/vibration issues. (Or am I mistaken?)
I also didn't like the fact that no part of the spacer was in direct contact with the centre of the hub, and hence the hub wasn't taking
any of the weight. That's why I looked at the spigot idea. I wondered whether I could use that to fill the gap between the hole in the middle of
the spacer and the hub itself. If so, then the spacer would end up a snug (tight?) fit on the hub, and the hub would then be bearing the weight. It
should also eliminate any centering issues.
Am I completely up a gum tree thinking this way?
Would the thickness of the spacer (20mm) prevent the spigot making contact with the hub?
The offset I'm trying to correct is 23mm. If I did go with hubcentric, could I get away with using just 15mm, provided nothing rubbed anywhere.
After all, 8mm out either side isn't too much... is it?
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Strontium Dog
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| posted on 31/12/10 at 06:02 PM |
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This is a good easy to understand write up of how hub centric spacers work
http://bernardembden.com/xjs/hubcentric/index.htm
Personally, with the power I run in my cars and the cornering loads I get I would not use anything else. Definately the way to do it IMHO!
To be honest, it is the improved centering when mounting the wheel and the fact that you don't need long unsupported studs that is the main
reason to use them of course!
They have to be better when running over the curbs or hitting a pot hole in the road too! Again IMHO!
[Edited on 31/12/10 by Strontium Dog]
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