Question about Trigo fia wheels

[MAStuart]

Do Trigo FIA wheels that fit original CSX cars have different thickness of the wheel center hubs? Front 7 1/2 rears 9 1/2. I am not asking about back spacing. I am concerned about the thread engagement of the Knock off threads. I only have a front wheel and the thread engagement seems fine on the front hubs. But putting the front wheel on the rear hubs I only have 4 turns of thread engagement.

Mark

[CNGreen]

Originally Posted by MAStuart

Do Trigo FIA wheels that fit original CSX cars have different thickness of the wheel center hubs? Front 7 1/2 rears 9 1/2. I am not asking about back spacing. I am concerned about the thread engagement of the Knock off threads. I only have a front wheel and the thread engagement seems fine on the front hubs. But putting the front wheel on the rear hubs I only have 4 turns of thread engagement.

Mark

My Trigos are not FIA's but yes, it seems the rears may be thicker because the do not seat as low as the fronts. I've never measured them but the eyeball test says there must be a difference there.

I have 12k on mine over 10 years so it hasn't been an issue for me. Just make sure you use liberal anti seize, whack the snot out of the spinner (with the wheel on the ground. Pounding on the suspension at full droop no bueno) and use safety wire.

HTH,

[1985 CCX]

CSX3021 has a set of Trigo's on it.

[MKS427]

I would contact Trigo.

[CNGreen]

You can see here how much engagement I have front vs back:

[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

[LMH]

Seems to me I remember reading about someone having to machine off some of the back side of the wheel to make it fit correctly. I don't know where I read that now though.
Wish I could be more help!
Larry

[MAStuart]

Larry machining 1/2 off the back would make thread engagement about prefect. But it would also give it a half inch more backspacing. Would this cause problems? I don't know.

Mark

[LMH]

A 1/2" sounds like a lot. Not sure the pin depth would allow for that much. I was thinking what I read was about 10mm but I can't remember now. I did a search but came up dry.
I remember a thread here on CC where David Kirkham rebuilt an original rear suspension. You might look through that and see if it shows anything about an original hub length.
Original 427 Street Cobra Suspension Rebuild

Larry

[peterpjb]

using the same wheels on the same car with the the same spinners,
i machined 0,5" off the backside, works pretty nice

[MAStuart]

Peter It might not be a problem on my build . But I am not that far along on my build to see. There maybe problems of rubbing of tires on the inside or interference with the brakes. I am scratch building a Daytona coupe.

Mark

[MAStuart]

Were there more than one length of hubs used on these cars. Meaning Depending on the use of the car. For instance Are wire wheel hubs shorter than pin drive hubs? I know some converted spline drive hubs to pin drive. Are hubs on competition cars different?

My front hubs use the longer axle. So the bearing races are spread apart a little farther apart and outside bearing dia is larger where it mounts to the axle. It uses a lm 12749 instead of lm11949. I think this hub is still about the same length a hub used for the shorter axle. But internally the races are spread apart further.

So were there different length rear hubs?

Mark

[LMH]

I think the wire wheel hubs are the same dimensions front and rear. The wheels are interchangeable front to rear on the leaf spring roadster.
Larry

[MAStuart]

Larry I too would think wire wheel would be interchangeable front to rear. When some changed them to pin drive did they get good thread engagement?

Mark

[LMH]

I'm not sure about the hub change when drive pins were added for alloy wheels.
Larry

[1985 CCX]

Trigo's on CSX3020