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Car Forum / Saab Cars / April 2005

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[Saab_c900] Wheel spacers for use with Ronal/Shelby wheels?

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Craig's Saab C900 Site - 04 Apr 2005 03:47 GMT
Hi everyone,

I've been having problems finding lugnuts the right length to use with the
Shelby wheels fitted to my 1983 900S. I've had to install additional
washers under the lugnuts on a couple of the wheels as the nuts have
bottomed out (only just) on the brake disks.

Short of trying to track down special lengths of lugnuts, I'm looking at
wheel spacers as another approach. There are quite a few places selling
wheel spacers that work with 4 x 114.3 mm wheels, but very few seem to
have the openings large enough to accept the lugnuts that the Shelby
wheels require (with a shank going all the way through the wheel to keep
them positioned properly). If the lugnut openings are slightly chamfered
it's probably a moot point as the nuts that bottom out would only be going
too far by 0.5 mm at the most!  Come and explore our site, and check out
our web-forums, mailing list, etc.

The closest thing I have found which is actually made for Saab's on Ebay
is this listing:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33749&item=796
6016037&rd=1


But the seller has written back to me saying they're not suitable for 4 x
114.3 mm wheels. That's a pity since the look to have bolt openings which
are big enough to suit the lugnuts used to hold the shelby wheels in
place, but since the nuts are exactly the same depth as the hub section of
each Shelby wheel, it probably doesn't matter.

In any case, I've been checking out a few others, namely:

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&rd=1&item=7965147545&ssPageName
=STRK:MEWA:IT


and

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&rd=1&item=7965163361&ssPageName
=STRK:MEWA:IT


Spacers that are about 10 mm or under would be fine I think as they won't
move the wheels out too far from the stock position but still allow the
current bolts to be used. As a benefit the lugnuts would sit a short
distance away from the brake disks but not have too little threaded
section of the bolts to bite onto.

What are your views on this idea? None of the auto part places around this
area carry lugnuts that are slightly shorter than the ones I'm using now,
so using spacers would give the car a slightly wider track and allow the
lugnuts to secure the wheels properly without having to use multiple
washers under some of the nuts.

Regards,

Craig.
yaofeng - 04 Apr 2005 12:22 GMT
I am sure you'll get many more responses on SAABnet.  At least you can
search through the archive if you are not allowed to post there.
KeithG - 04 Apr 2005 12:32 GMT
Craig,

I am just guessing here... Don't the 'Shelbys' had a straight shank (Mag
Style) nut with a washer just below the hex?

http://www.mcgard.com/custserv/tech_support.asp

You may need to buy a set of lug nuts which are the right thread pitch
then machine them to length so that they tighten down properly. There
are different lug nut washers. I would NOT use a spacer if I could avoid
it. You have a set of rims which are dimensionally correct and do not
rub on your car when the wheel mount flange is against the rotor face. I
know I went through this with a friend that had an older set of Saab
rims a couple years ago. I think we found something at Jegs, IIRC. By
the way, 114.3mm is exactly 4.5in... Determine the stud diameter and
pitch (12mm x 1.25mm?) and desired shank depth and see what Jegs and
Summitt have.

good luck,

Keith

> Hi everyone,
>
[quoted text clipped - 47 lines]
>
> Craig.
Craig's Saab C900 Site - 04 Apr 2005 13:04 GMT
>I am just guessing here... Don't the 'Shelbys' had a straight shank (Mag
>Style) nut with a washer just below the hex?

Yes that isn't how I'd describe it, but that's right. 8-)

>You may need to buy a set of lug nuts which are the right thread pitch
>then machine them to length so that they tighten down properly.

I've thought of simply taking a grinder to the base of each lugnut and
shaving off a very small amount (maybe 1 mm or so). I'm not sure if grinding
the metal would affect the integrity of the nuts though - it'd be like
heat-treating the ends which might make the metal in the shank section
weakened. Anyone with metalurgical knowledge able to shed any light on this?

> I would NOT use a spacer if I could avoid
>it. You have a set of rims which are dimensionally correct and do not
[quoted text clipped - 4 lines]
>pitch (12mm x 1.25mm?) and desired shank depth and see what Jegs and
>Summitt have.

I am not keen on spacers either, but at the same time I'm not keen on taking
grinding, etc. tools to the lugnuts which would alter the bonding between
the metal atoms due to the excessive heating of grinding off the metal.

That's why I've asked the question since I'm not sure which is the better
way to go. I'm tempted to try the grinding route but would prefer to find
lugnuts which a slightly shorter shank to try out first.

Regards,

Craig.
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Craig's Saab C900 Page --> http://lios.apana.org.au/~c900 Sydney, NSW Australia
   Craig's Saab C900 Workshop -- For all Saab C900 Enthusiasts world-wide!
 http://www.saab900classic.net http://www.saab900.org c900@lios.apana.org.au
 Come and explore our site, and check out our web-forums, mailing list, etc.

KeithG - 05 Apr 2005 04:11 GMT
Grind away! Try not to get them too hot, though, to maintain the heat
treatment. Dip them in cool water periodically while you are doing this.
If you have a friend with access to a lathe, that would be better. 1mm
is nothing. Take 2 to make sure you get a good clamp.

KeithG

>>I am just guessing here... Don't the 'Shelbys' had a straight shank (Mag
>>Style) nut with a washer just below the hex?
[quoted text clipped - 30 lines]
>
> Craig.
Craig Ian Dewick - 08 Apr 2005 00:35 GMT
>Grind away! Try not to get them too hot, though, to maintain the heat
>treatment. Dip them in cool water periodically while you are doing this.
>If you have a friend with access to a lathe, that would be better. 1mm
>is nothing. Take 2 to make sure you get a good clamp.

I'll make sure I clamp each onto into a large vice which should aid heat
dissipation. Haven't got a grinder yet, but that's on the way. 8-)

Regards,

Craig.
Signature

Craig Dewick (craig@poison.lios.apana.org.au). http://lios.apana.org.au/~craig
APANA Sydney Deputy Regional Co-ordinator. Operator of Jedi (APANA Sydney POP)
Always striving for a secure long-term future in an insecure short-term world
  Have you exported a crypto system today? Do your bit to undermine the NSA.

 
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