Lotus Elan

26R 5 peg wheels

PostPost by: zeca » Wed Aug 28, 2019 2:27 pm

Hello,

I bought a used set of 26R 5 peg wheels and the 26R spinners. When installing the wheels in the car, i realised that the spinner don?t go at the end of the thread of the Hub.

This set is from Kelvedon, They told me to remove 5 or 10mm inside the wheel....

Any help on this?


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PostPost by: zeca » Wed Aug 28, 2019 2:41 pm

dimension of the wheel
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PostPost by: jabingb » Thu Aug 29, 2019 5:00 am

I don't have one of my wheels off the car but even 5-10mm doesn't appear to be enough? And then there's the issue of does the wheel have enough meat to safely allow it. Is it a matter of hub/spindles not being long enough? I take it this is not a true 26R but some adaptation? Here are a couple pixs of my Series 2 front and rear, the latter with the protruding spindle/hub tube, albeit rusty.
img_3730.jpg and

img_3731.jpg and
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PostPost by: zeca » Tue Sep 03, 2019 2:26 pm

Does anyone have a set of 26R 5 peg that can tell me the depth of the wheel? Mine is about 35mm as image above.

thanks
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PostPost by: Dale Harvey » Thu Jan 30, 2020 4:54 am

zeca wrote:Does anyone have a set of 26R 5 peg that can tell me the depth of the wheel? Mine is about 35mm as image above.

thanks

Yes, I have a set of brand new ones and they are the same. I haven't decided what to do about it yet but I am certainly not happy with only half the amount thread being used. I would not be happy machining the mounting face either as that will make the offset worse.
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PostPost by: Dale Harvey » Sat May 23, 2020 6:08 am

Has anyone had a go at solving this problem of not enough threads on the hub?
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PostPost by: msd1107 » Sat May 23, 2020 3:38 pm

RE: Number of threads.

Carroll Shelby's book may address that question.

There is a professional book on fasteners, but, at $300+ probably not many people have it.

I seem to remember that something like 4 threads engaged provides sufficient strength.

Perhaps Rohan can give us guidance.

Cheers,

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PostPost by: gjz30075 » Sat May 23, 2020 3:53 pm

I think you mean Carroll Smith.
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PostPost by: bitsobrits » Sun May 24, 2020 1:36 am

Carrol Smiths advice on threaded fasteners (from memory, so beware) was 1.5 diameters for thread engagement, with a minimum of 1 diameter. I do not recall if he provided any advice on knock off nuts, which may well be different.

In any case, I would not feel comfortable with only 4 threads engaged on a heavily loaded wheel nut. I would be looking for a least one thread past the end of the nut, or a thread engagement length equal to at least the diameter of the threads.
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PostPost by: nmauduit » Sun May 24, 2020 8:29 am

bitsobrits wrote:Carrol Smiths advice on threaded fasteners (from memory, so beware) was 1.5 diameters for thread engagement, with a minimum of 1 diameter. I do not recall if he provided any advice on knock off nuts, which may well be different.

In any case, I would not feel comfortable with only 4 threads engaged on a heavily loaded wheel nut. I would be looking for a least one thread past the end of the nut, or a thread engagement length equal to at least the diameter of the threads.


The above setup appears to have a problem (hub too short for this specific application?) and I also would not drive at speed on 4 alloy threads, but if I may, "a thread engagement length equal to at least the diameter of the threads" is clearly impossible with the stock KO nuts, that have a threaded depth about half of their diameter (and are engaged on steel wheel 7 to 8 threads I would say)...
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PostPost by: vstibbard » Mon May 25, 2020 11:15 am

I agree, Gordon who bought my S2 put Kelsport 26R 5 peg wheels on and it had only a few threads holding it on, I suggested best not to drive it.

For my mind a poorly engineered solution and an accident waiting to happen

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PostPost by: Dale Harvey » Mon May 25, 2020 11:23 pm

I think all agree that there's not enough threads on the hubs for this setup. What I need is a good and safe way of extending the threaded section on the hubs.
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PostPost by: 1owner69Elan » Tue May 26, 2020 1:20 am

'69 Elan S4 SE
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PostPost by: elancoupe » Tue May 26, 2020 1:53 am

Dale Harvey wrote:I think all agree that there's not enough threads on the hubs for this setup. What I need is a good and safe way of extending the threaded section on the hubs.



I have had these Kelvedon wheels on my car 21 years now with no issues. My TTR spinners have 11 total threads, with between 8 and 9 engaged. Given that Cobra Halibrands only have about 9 total threads, I don’t think it’s a problem.

My wheels certainly do not have as many exposed threads like the photo at the top of this thread. Perhaps spinner differences?
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PostPost by: 1owner69Elan » Tue May 26, 2020 2:11 am

TTR replica 26R wheels and spinners. Full engagement of threads front and back. Pretty much the same as "jabingb" 's true 26R.


Front:
IMG_5443.jpeg and





Back:
IMG_5440.jpeg and
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