Question about Trigo fia wheels

[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

[db replicas]

I believe that original FIA wheels were 6.5" and 8.5" wide.
It looks like the outer "Dish" of the wheel is the same on the 7.5" and 9.5" with the extra inch added to the rear rim and then the centre boss extended by about an inch.
I have both 427 and FIA wheels here with 295 Avons on them. It looks like the rears have around an extra inch of caliper clearance compared to the 427 wheels.
I could take some measurements tomorrow (It's almost 11:00pm here right now) if it's would be of any help.
P.S. I have an "Original spec" Coupe chassis and body coming to me in the next couple of weeks, so if you are building an orig. spec. Coupe I might have even more dimensions then. :-)

[MAStuart]

David I think you are right On the rim widths. I do not know for sure but I think If you used 6 1/2 inch wheel on the front. you do not have to bend the steering arms for clearance. I would be interested in knowing what your backspacing and hub thickness is on your wheels. It would also be interested in knowing what backspacing and hub thickness was on some of the original 6 1/2 and 8 1/2 wheels was.

I would like to hear about your coupe. and where it came from. Poland? You can see my build under the scratch builders forum here at CC. It is burial in that forum somewhere. I went back and found my thread. So here for your viewing pleasure is the link scratch build

Thanks for posting
Mark

[db replicas]

the Trigo FIA wheels have 1/2" more space for calipers than 427 wheels.

[MAStuart]

Db Replicas It might have a 1/2 inch more caliper clearance but how thick is the hub of the 9 1/2 inch Fia trigo wheel. If it is thicker than 3 1/2 it will have less that 4 turns of the spinner on my rear hubs to hold it on.


I ask Curtis at Trigo what the hub thickness was on the rear wheel and was told 3.725. At that thickness I would only have about 2 turns of the spinner to hold the wheel on. Not good!

I just need to get a simple real world measurement of a 9 1/2 wide Trigo FIA wheels hub thickness that will fit on an original car.

Logic says that it has to have a thinner wheel hub thickness and still maintain the right backspacing to fit on an original car. The rear hubs on the cars are shorter than the front hubs on these cars.

Mark

[db replicas]

Hi Mark.
Flat face to flat face:-

Trigo FIA = 3 5/16"
Trigo 427 = 2 7/8"

[MAStuart]

Originally Posted by db replicas

Hi Mark.
Flat face to flat face:-

Trigo FIA = 3 5/16"
Trigo 427 = 2 7/8"

Thank you. Your FIA wheel would give one more turn than the front wheel I have would . The 427 wheel would give me plenty of thread engagement.

I asked Curtis to re measure one of his wheels. We will see that he has to say.

Mark

[66gtk]

This thread really has me wondering what wheels are on my car. My ERA has 6 PIN FIA wheels and there is plenty of engagement front and back. They were originally installed on a turn-key FIA car, but now they are on my 427. Next time I have them off, I'll do some measuring.

[MAStuart]

Originally Posted by 66gtk

This thread really has me wondering what wheels are on my car. My ERA has 6 PIN FIA wheels and there is plenty of engagement front and back. They were originally installed on a turn-key FIA car, but now they are on my 427. Next time I have them off, I'll do some measuring.

To make sure everyone stays on the same page on this matter. Make sure when you do this you measure how long your front and rear hubs are from the mounting surface to the ends of the threads . Also the wheel width, backspacing, and hub thickness of the wheel.

mark

[Cobra #3170]

I just finished a 1 hour wrestling match with alternator mount, so far alternator is winning. Power steering pump and expansion tank are next.

Original Magnesium Cobra FIA Wheel:

Rim width 8 5/8"
Overall width of wheel 9 7/8"
Hub flat to hub flat 2 7/8"
Back space out side of rim to inner hub flat 3 1/2"

Looking at this I imagine you could put these wheels on a custom mandrill
and machine .1875 off each bead and get some legal 9" wheels maybe that is what they did back in the day. Bead seats are quite thick.

[MAStuart]

Curtis at Trigo also measured a wheel again. He found a flaw in his calculations. He now said the hub is about 3 5/16 to 3 3/8 thick. This would give another turn of threads or so. This would give me about 5 to 5 1/2 threads of engagement.

The newer wheel produced by trigo now have a thicker hub than original wheels so depending on the length of your drive hub you may or may not have enough thread engagement.

How many spinner thread do they need to be on to be considered safe?

Mark

[Cobra #3170]

Originally Posted by MAStuart

Curtis at Trigo also measured a wheel again. He found a flaw in his calculations. He now said the hub is about 3 5/16 to 3 3/8 thick. This would give another turn of threads or so. This would give me about 5 to 5 1/2 threads of engagement.

The newer wheel produced by trigo now have a thicker hub than original wheels so depending on the length of your drive hub you may or may not have enough thread engagement.

How many spinner thread do they need to be on to be considered safe?

Mark

I have run spacers from time to time on both 15" and 16" wheels, I hate to admit it but a couple of times the spinner had only about 1/2 the threads engaged and it worked (wheel did not come off).

I had two major set backs yesterday, found a crack in my expansion tank assembly where it goes into the intake manifold and the crank fire sensor hits the alternator/water pump belt. I moved that sensor rearward about 6 years ago but the FAST tuner guy did not like it being offset rearward so he moved it back forward when they dynoed the engine. I got to move it back while in the car not fun. I asked them why they did not notice that it lined up with the crank pulley path (no answer). Today I hope to add power steering fluid, water and water wetter assuming I can get the tank fixed and begin the wiring process. Should be running by Sunday unless I hit other problem areas.

[t-5gt]

I know this is an old post but I also ran into this issue and had a machine shop remove the extra material from the front wheel hubs. Danbury Competition Engines in Connecticut did an excellent job.

[eschaider]

And the pics are where ???

[MAStuart]

What pictures do you need?

[PDUB]

Originally Posted by MAStuart

What pictures do you need?

Perhaps Ed is asking about the post just above his pertaining to the before and after machining process on the wheels?