Question about Trigo fia wheels

[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

[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.

[MAStuart]

Thanks Jeff! Sounds like I have been concerned with something that really isn't a problem.

Mark

[Cobra #3170]

Originally Posted by MAStuart

Thanks Jeff! Sounds like I have been concerned with something that really isn't a problem.

Mark

Mark do you still need dimensions on original FIA wheels? I have been installing my new engine this week and have the ability to measure a bare 8.5" wheel if you need it. The competition cars were illegal with 9.5" pin drive wheels SCCA only allowed 1.5" additional width over 7.5" stock wheels. Dick Smith told me he borrowed a set of 9" pin drive Halibrands for Daytona so that he would be legal.
I have never seen any 9" wheels in person, most ran 8 1/2" pin drives for legality on the rear.

The new engine is a wiring nightmare, have to wire FAST XFI in place of a Classic FAST quite different should be running by Friday in case anyone cares.

[Shootnride]

Originally Posted by Cobra #3170

should be running by Friday in case anyone cares.

I do !

Will you be at Good Guys in Pleasanton in June ?

Ted

[MAStuart]

Bruce if it is not too much trouble. Overall width. backspacing, and thickness of the hub of the wheel.

Good luck with your new engine. If you type I read what you type. If I lived close I would be willing to help in any way I could in your car adventures.

Thanks again
Mark

[Cobra #3170]

Originally Posted by Shootnride

I do !

Will you be at Good Guys in Pleasanton in June ?

Ted

We are planning on going but will be a completely untested set up. New shock pistons and engine with much lighter crank. We will have to try and tune it there. There are no events to run so I will break in the new diff on the subdivision roads and hope it all works out. I got oil pressure today spinning the dry sump pump, radiator is in, brakes installed, steering rack tied down, all fuel lines reconnected. Power steering pump, alternator and wiring tomorrow.

[Cobra #3170]

Originally Posted by MAStuart

Bruce if it is not too much trouble. Overall width. backspacing, and thickness of the hub of the wheel.

Good luck with your new engine. If you type I read what you type. If I lived close I would be willing to help in any way I could in your car adventures.

Thanks again
Mark

I will measure the wheels tomorrow when I go out to garage, too tired tonight.
Old people need their sleep!

[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"

[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 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

[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