Question about Trigo fia wheels

[MAStuart]

Thanks for the replies so far. I was hoping the rear wheel hubs were thinner because thicker would mean less thread engagement. I will see if I can post pics later.

Mark

[cobrakiwi]

The FIA wheels I have here for Kevin Ahern's build measure,
Front 3 9/16
Rear 3 3/8
I am pretty sure Kevin got these wheels from trigo.

If not Kevin may chime in and correct me.

[MAStuart]

Cobrakiwi Is the build you talked about a leaf sprung original spec suspension car?

[MAStuart]

Ok here is what I am trying to remedy before I get any further along.
Right now I only have 1 front fia wheel from Trigo. Will get another front soon.

In the below picture is a front hub mounted in the front wheel. Thread engagement looks perfect. Spinner is on about 9 1/2 turns.


In this picture a rear hub is mounted in the same wheel. I don't think there is enough thread engagement. It is only about 4 1/4 turns on.


Wheel hub thickness is about 3 7/16. This wheel has the right backspacing is correct for an original car. I was hoping that that a rear Trigo wheel had a thinner hub and get more thread engagement.


In this picture you can see that the rear hubs are shorter than the front ones by about 3/4 of an inch.

Does anyone know how long the hub is from the mounting flange on original cars that fit these wheels?

[MAStuart]

It was suggested I call Trigo. I called and got some help. I was told the rear wheel hubs were thicker. This will give me even less thread engagement. They were aware of this problem. They said they made special spinners that the backs were cut different to help with the problem. He sent me a picture of it and a standard one but I am not sure it would help enough.

I also called Vintage about there FIA wheels. Bob said there rear fia wheel hub thickness was 3 inches. This would give me about 4 more threads of engagement with she spinners I have.

I assume other have run into the same problem I am having.



Mark

[Cobra #3170]

Originally Posted by MAStuart

Thanks for the replies so far. I was hoping the rear wheel hubs were thinner because thicker would mean less thread engagement. I will see if I can post pics later.

Mark

The original 427 rear hubs are 3.75" from outside edge to mounting surface
the front hubs are 4.5". I remember having to buy two new L and R front hubs from Shelby American and chase the hub threads to provide enough thread to mount FIA rear wheels on the front of my car in the 1970's. Conclusion, they are thinner in the rear on a stock 427, hope this helps.

[MAStuart]

Thank You Bruce!

I was hoping you would speak up. My front and rear hubs are real close to the dimensions you posted. So you are saying the wheel hub itself on the rear wheels is thinner? If so that is good new for me!

I have seen where you posted you have several original wheels. If they are in an easy to access area for you. Is there any chance you could take a few measurements with a tape of the width , backspacing, hub thickness.

If you cant I understand. I appreciate your participation here on Club Cobra.

Mark

[MAStuart]

Bruce and everyone else does anyone know the difference between the standard pin drive hubs and the competition hubs? I figured Bruce would know.

Mark

[1985 CCX]

My Mag FIA's ( race wheels) rears.

[MAStuart]

Jeff nice picture! Looks like plenty of thread showing. 8 1/2 inch wheel?

Mark

[1985 CCX]

Yes, 8.5" as they were a touch narrower in the day.

Called Lynn, he said yes on the Trigo question.