Middlebridge wheels/Locking Nuts/Centre Caps

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Middlebridge wheels/Locking Nuts/Centre Caps

Post by philhoward » Sun Mar 04, 2018 7:51 pm

There’s several different seat types across those you quoted.


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Post by gtcse8 » Sun Mar 04, 2018 8:02 pm

I have some that I used on my old GTC, think I still have a New set left that I promised to Will.


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Post by drcdb15 » Sun Mar 04, 2018 10:19 pm

philhoward wrote:
Sun Mar 04, 2018 7:51 pm
There’s several different seat types across those you quoted.
The MB uses 1/2 inch UNF with a 60 degree taper seat. The standard nuts fit a 19mm socket, so the only issues afaics with fitting any other nuts or locknuts are the internal depth (standard is approx 32mm but on my car it looks as if barely half of that is actually needed) and the overall diameter of the nut and/or the locknut key - depending on whether or not the locknut key needs to fit down into the hole in the wheel, or will work with the section of wheel nut that stands proud of the wheel surface. That hole diameter is 26mm (19mm socket approx dia. 25.5mm).


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Post by drcdb15 » Sun Apr 22, 2018 8:48 pm

Thanks to everyone who contributed to this thread for me. At long last I can close it by summarising which parts I've settled on and show what they look like.

First, with apologies to our club suppliers, I wasn't very impressed with what I could see of stainless nuts, they all seemed rather dull to me. Chrome, OTOH, flakes and rusts. Well, time will tell, but I opted for McGard bulge wheelnuts which are hard chromed and - they say - guaranteed not to flake or rust. Bold words indeed. Anyway, for now at least they are nice and shiny. I've got a full set of 16, but just in case anyone fancies me pots an' pans (Princess Annes? surely there's got to be a joke there somewhere...) I've also got a set of chromed Cruize lock nuts. For the record, all of these are 1/2 inch UNF-20 thread with a 60 degree taper seat.

For the caps, again I wasn't keen on the 'standard' caps, which are 76mm diameter and rather 'cylindrical', looking not unlike a cut-off soft drinks can. So I've gone for the 75mm diameter Compomotive caps, which have more of a domed shape. These have only a 60mm diameter recess on the end, which means you cannot fit 'standard' Scimitar or MB logo badges (which are usually 80mm dia) but if you really want the logo there are numerous suppliers on eBay who will do you vinyl stickers to any size you want for modest cost, you just send them a JPG of the logo you want to use. The 75mm caps are of course a little loose in the wheel, so you need to pack out the gap. I'm experimenting with double sided foam pads at present and we'll see how that goes. The supplier told me they typically use neoprene tape wrapped around the base of the cap until you've made up the 'missing' diameter. I haven't tried that yet, I'm working on getting the cap to be nipped in place by the wheel when the wheel nuts are tightened. It's all only cosmetic so none of this is critical.

Costs: McGard nuts: £38 (NOS), Cruize locnuts £40, centre caps £31.50, all prices include delivery. All from eBay, though I did shop around direct suppliers such as Rimmer, Burton, Scarborough, Larkspeed etc. None was as competitive direct as those suppliers on eBay. But be warned, you can get locknut sets for as little as £9 on eBay, and users report they shear at the first removal, so very much a case of getting what you pay for.

Other suppliers part numbers to look for: BEK 150; MGB P3035; Grayston SN16B; AHH 9152. These are alternatives, not McGards.

So here are the components, and the finished article:
McGard wheel nuts half inch 20 UNF.jpg
McGard wheel nuts half inch 20 UNF.jpg (132.51 KiB) Viewed 1761 times
Cruize lock nuts.jpg
Cruize lock nuts.jpg (82.68 KiB) Viewed 1761 times
Compomotive caps 75mm.jpg
Compomotive caps 75mm.jpg (68.94 KiB) Viewed 1761 times
001.JPG
001.JPG (106.37 KiB) Viewed 1761 times
002.JPG
002.JPG (163.95 KiB) Viewed 1761 times
003.JPG
003.JPG (149.05 KiB) Viewed 1761 times


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Middlebridge wheels/Locking Nuts/Centre Caps

Post by ABJ » Tue Apr 30, 2019 9:49 am

Hi Chris, could you put the ebay links up where you bought yours from, I've just had a look and it's a bit of a minefield for us less mechanically minded!
Cheers Andrew



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Post by drcdb15 » Thu May 02, 2019 6:33 pm

ABJ wrote:
Tue Apr 30, 2019 9:49 am
Hi Chris, could you put the ebay links up where you bought yours from, I've just had a look and it's a bit of a minefield for us less mechanically minded!
Cheers Andrew
I cannot find any McGard nuts on eBay at present, nor from any UK supplier on other sites. You can get them shipped from the US but with the weight you are looking at shipping costs of around £35!

If you go onto eBay and search All Categories for: "1/2 unf 20 wheel nut" then you will get a load of stuff available in the right thread for the MB, such as these:

https://www.ebay.co.uk/itm/20-Chrome-Wh ... ctupt=true

HOWEVER: you need to be careful in specifying the particular details that are important to you. Points to consider are:

1. Bulge or not? For any given diameter overall, bulge nuts will have the same hex size (that's the size of spanner you use to undo the wheels) as non-bulge nuts (I don't know the name for 'not bulge' nuts - anyone? - probably 'plain' or 'standard') but will exert an even pressure on the wheel owing to the 'collar' that is the bulge. Plain nuts that carry the hex right down to the taper result in a taper face that is scalloped on the outer edge. Whether this affects the pressure on the wheel or not is probably a moot point, depending on the particular dimensions of the seat for the nut in the wheel. More practically, the bulge on the bulge nut acts as a stop for the wheel brace, preventing it scoring the face of the wheel when the nut is turned. Without the bulge the spanner can contact the wheel itself and damage it. If you do not get bulge nuts, you may struggle to find locking nuts to match the style, and that may or may not be important to you.

2. Closed or open - a closed nut is what it says, closed at one end, so you can only screw it on so far. Open ended you can screw on as far as you like, but the stud will protrude through the open end and you may think that mars the appearance. But a closed nut must be deep enough to accomodate the full length of the stud and still hold the wheel on tight before the stud bottoms on the inner end of the 'closed' bit.

3. Alloy or steel ? I HOPE that when people advertise "alloy" they actually mean "alloy steel" I don't think I'd fancy relying on an aluminium alloy nut to hold my wheels on! But since steel is anyway an alloy I'm not sure what 'alloy steel' actually means. I've seen chrome plated, zinc plated and of course stainless steel, which is not usually plated with anything. Stainless is usually a tad dull in my experience, BUT it will not rust. Chrome is nice and shiny when new, but can flake and rust, which is why the McGard's look attractive - they claim their chrome is resistant to this. They also claim the steel made for their nuts is made specially just for them... Given the size of the typical steelworks and blast furnaces you may like to take this with a pinch of salt (pardon the chemical pun). More likely their steel has had some custom post manufacture treatment like nitriding etc. Anyway, chrome flakes, McGard chrome doesn't (allegedly). Zinc plated steel ? I have no experience. Like galvanised, I presume the zinc will heal after rupture so preventing rusting of the steel underneath, but I have no experience other than BZP screws which are usually fine for a few years, but if they do rust there's no recovery.

4. Wheelsets - you have 4 x 4 = 16 wheelnuts. But if you plan on fitting 4 locknuts as well then you only need 12 nuts. Many firms sell packs of 16 or 20 assuming you have 5 or 6 stud wheels and will be using locknuts as well. You may want to buy the 12 pack, or you may want to consider 16 if you like the style and it's not available in 12. Also, getting 16 will be more pricey, but it will give you some spares.

5. Locknuts - fit or don't fit? Last time I got my daily driver to the garage the chap said no-one nicks alloys any more as every car has them, so locking nuts are just a pain and don't actually have any effect on security. After all, when did you last see a car up on bricks after the wheels had been stolen? Paradoxically eBay is awash at present with McGard locking wheel nuts sets! So if you *really* must have McGard's, you could consider having EVERY nut as a locking one... Not totally silly - you'd get fantastic security on the wheels, and you'd get perfect matching of all nuts, rather than the locking one being odd man out. Plus you'd save the cost of the 'ordinary' nuts.

6. Taper: finally don't forget you need nuts with a 60 degree tapered seat. A flat seat or any other angle seat will NOT be 'near enough', and will seriously impair the security of the wheel, so this point is NOT negotiable !!

Right, that's the nuts. Enough for one post, I'll look at the Cruize lockers and centres separately.

EDIT: comment on bulge nuts corrected.
Last edited by drcdb15 on Thu May 02, 2019 9:32 pm, edited 2 times in total.


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Post by drcdb15 » Thu May 02, 2019 7:04 pm

I said earlier. eBay is awash with McGard locknuts, and they seem to be priced at £26 so a lot cheaper than I paid for my Cruize ones. On eBay, in Vehicle Parts & Accessories/Car Wheels, Tyres and Trims/Nuts, Bolts & Studs search for "mcgard locking 1/2 unf" and this will give you the ones. There is one set selling at £25, all the rest are £26, and it seems to be the 24138SU that you want. I haven't seen the internal depth of this nut shown so be sure you buy from a place offering returns in case it turns out they're too short inside for the MB, but I think this is most unlikely given the range of cars listed and knowing the various wheel types that Reliant used over the years on various models (Ford, Volvo etc). Incidentally, eBay seems to prefer "locking nuts" over "locknuts". (I have assumed you will go for a chromed bulge nut for the other nuts - if not, the style of these may not be what you want).
Last edited by drcdb15 on Thu May 02, 2019 7:31 pm, edited 1 time in total.


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Post by drcdb15 » Thu May 02, 2019 7:22 pm

These are the wheel centre caps I got, slightly more expensive now but only a couple of pounds: https://www.ebay.co.uk/itm/Compomotive- ... Swq~tZR9XB

Remember I said these are dia 75mm, and the MB wheel centre diameter is 76mm, so you will need to wrap some tape around these to keep them in place.

If you want the 'standard' GTE caps, they are here: https://www.ebay.co.uk/itm/MAG-Princess ... SwpLNX9MRs

same price but should be a straight fit. As I said, I preferred the more domed style of the others. NOTE that when the supplier refers to Princess Anne wheels, he means the original SE5 era style (were these made by Dunlop?) and NOT the more recent 'Princess Anne' wheels fitted to the MB (made by Performance Wheels in Australia).

For anyone else reading this who fancies these caps in their Wolfies, note that these: https://www.ebay.co.uk/itm/Wolfrace-Slo ... 0005.m1851
are the correct size and also have a flared lip rather than a flat one, so again they are fit and forget BUT they are diameter 80mm, so will NOT fit the MB wheels - only WR slots, 14 and 15 inch.


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Post by philhoward » Thu May 02, 2019 8:50 pm

3. Alloy wheel nuts

Aluminium alloy wheel nuts were used on the Dolomite Sprint and they didn’t fall off?


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Post by drcdb15 » Thu May 02, 2019 9:18 pm

philhoward wrote:
Thu May 02, 2019 8:50 pm
3. Alloy wheel nuts

Aluminium alloy wheel nuts were used on the Dolomite Sprint and they didn’t fall off?
Not my field at all, but it seems on the Dolly forum that "The alloy used for wheel nuts is 2014 which is a hard alloy." This is from a thread (sorry...) where a member is enquiring whether he can recover a stripped thread on his alloy wheel nut by helicoiling. OEM aluminium alloy is one thing, I don't know that I'd like to rely on something from eBay being as reliable, certainly not where something as precious as my MB is at stake ! :D


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Middlebridge wheels/Locking Nuts/Centre Caps

Post by ABJ » Tue May 07, 2019 1:25 pm

WOW!! Thanks Chris that is just what I needed, I have already ordered some whilst it is all fresh in my mind, thank you.



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Post by Old and Slow » Tue May 07, 2019 5:02 pm

Just to reassure you, on the 911 I have alloy wheel nuts, factory standard; apparently they keep the unsprung weight low.
They've never failed me yet (touch wood!) !


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