Pin drive bolts splitting Help Please

[Dominik]

Great!

I hope the manufacturers of wheels and adapters were reading this...

Dom

[cdnus]

David
After viewing the photos of the finished taper end it looked familiar, so I measured the same ends of the vintage nuts that I am now using.
The end has been machined off flat & remains .040 wide after the inside (thread) has been chamfered @ (looks like 90deg.) to a face width of approx .060. All edges are nicely finished.
So it would appear whoever made these up took the design under serious consideration as have you.
The only shortcoming is the internal hex, which can present a problem on installation & removal if one is not very carefull.

Craig

[Paul F]

I've contacted Trigo, Vintage, and Compomotive about our discussion. Vintage said they would make some comments on this thread. I'm reviewing information with Compomotive. I have not heard back from Trigo.

[jmarsey]

I am running the Compomotives on the jbl. I split one years ago, replaced it and remembered thinking the design was not very forgiving. They are very easy to split if not careful. The car is due for new rotors so I’ll be disturbing these pins. Would love to replace them David.

Paul, let me know if you get specs from Compomotive, otherwise I know I have that old split one here somewhere to measure. Just have to find it.

Thanks David and so cool you are helping out here. Amazing thread.

Talk soon, John

[Paul F]

John, will do.

David's pins are installed. Thanks David!

You can see the difference in these pictures.

This picture shows the Compomotive pin. You can see a shadow caused by the gap between the hub and the pin. The pin has the smaller taper angle. Also notice the fractures at the top of the pin.



This is the same hub with the David's pin. Notice there is no shadow because the tapers match.

[Ant]

John,

As you know I have Compomotives from the same supplier as you, they told me there parts are exactly the same as Trigo, so whether they deal with the same supplier as Trigo or source from L Park I am not sure!
There has been a lot of good input into this post and it appears the Trigo pins are too hard, but that of course doesnt account for the incorrect seating taper, and the sharpish end where the taper and threads meet.........!

David in well onto it and I think we are fortunate that he is kind enough to make us the correct parts for the job, especially as some of our cars do some serious track work. I am under the impression he might be out of the office and we are touching base on after 26th January so I can get my pin drives underway.

[jmarsey]

Hey Ant,

I forgot you were running the Comps too. Yes, I got involved way late on this excellent thread and thanks for tipping me off in your last email. I definitely need a set of these. Great that David can help out like this.

Always good to hear from you man!

Talk soon, John

[PaulProe]

I've been following the thread, adding input when appropriate. Thought I was OK but now I wonder.

The wheels I have are alleged to be Trigos. I spoke to Vintage and determined they aren't theirs. The wheels are cast with "Cobra2" on the spoke, the adapters appear to be stud centric, not hub centric. The adapters are a black oxide, not plated. Everything points towards being Trigo but . . .

The pins and adapters both are machined to a 60 degree taper, not the 76-79 that David found. I am estimating the wheels to be around 5 yrs old. I bought them used so I can't verify their source or production date.

Can anyone help me identify the brand? David, if, in fact, they are Trigo's should we be concerned about different tapers on the same brand? I can attest to the 60 degrees.

? ? ?

Paul

[David Kirkham]

Originally Posted by Ant

John,

As you know I have Compomotives from the same supplier as you, they told me there parts are exactly the same as Trigo, so whether they deal with the same supplier as Trigo or source from L Park I am not sure!
There has been a lot of good input into this post and it appears the Trigo pins are too hard, but that of course doesnt account for the incorrect seating taper, and the sharpish end where the taper and threads meet.........!

David in well onto it and I think we are fortunate that he is kind enough to make us the correct parts for the job, especially as some of our cars do some serious track work. I am under the impression he might be out of the office and we are touching base on after 26th January so I can get my pin drives underway.

Thanks for the nice phone call. One day I will have to visit New Zealand. I will certainly have to visit the places where the Lord of the Rings was shot.

Thanks for the kind words on the pins. We are happy to help out any way we can.

David

[David Kirkham]

Originally Posted by jmarsey

I am running the Compomotives on the jbl. I split one years ago, replaced it and remembered thinking the design was not very forgiving. They are very easy to split if not careful. The car is due for new rotors so I’ll be disturbing these pins. Would love to replace them David.

Paul, let me know if you get specs from Compomotive, otherwise I know I have that old split one here somewhere to measure. Just have to find it.

Thanks David and so cool you are helping out here. Amazing thread.

Talk soon, John

John,

Thanks for the kind words. I am sure there are LOTS of things out there where you guys know WAY more than I will ever know. Let me know if we can help in any way.

David

[David Kirkham]

Originally Posted by cdnus

David
After viewing the photos of the finished taper end it looked familiar, so I measured the same ends of the vintage nuts that I am now using.
The end has been machined off flat & remains .040 wide after the inside (thread) has been chamfered @ (looks like 90deg.) to a face width of approx .060. All edges are nicely finished.
So it would appear whoever made these up took the design under serious consideration as have you.
The only shortcoming is the internal hex, which can present a problem on installation & removal if one is not very carefull.

Craig

Craig,

If you still want some shorter ones for the Vintage wheels, just let me know. We have some more in the mill right now.

David