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9Likes
05-23-2017, 03:53 PM
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CC Member
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Join Date: May 2007
Location: Stoke on Trent (Potteries),
UK
Cobra Make, Engine: DB427SC. 289FIA. COUPE. Round tube, Aluminium body, 427FE
Posts: 93
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Not Ranked
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. :-)
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05-23-2017, 04:20 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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Not Ranked
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
Last edited by MAStuart; 05-23-2017 at 07:13 PM..
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05-23-2017, 04:22 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
Posts: 1,009
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Not Ranked
Cobra wheel hubs
Quote:
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
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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.
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05-23-2017, 04:53 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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Not Ranked
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
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05-23-2017, 05:04 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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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
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05-23-2017, 06:11 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,000
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Not Ranked
My Mag FIA's ( race wheels) rears.
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05-23-2017, 07:17 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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Jeff nice picture! Looks like plenty of thread showing. 8 1/2 inch wheel?
Mark
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05-24-2017, 06:28 AM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,000
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Not Ranked
Yes, 8.5" as they were a touch narrower in the day.
Called Lynn, he said yes on the Trigo question.
Last edited by 1985 CCX; 05-24-2017 at 07:58 AM..
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05-24-2017, 07:09 AM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
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Thanks Jeff! Sounds like I have been concerned with something that really isn't a problem.
Mark
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05-24-2017, 11:31 AM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
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Wheels
Quote:
Originally Posted by MAStuart
Thanks Jeff! Sounds like I have been concerned with something that really isn't a problem.
Mark
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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.
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05-24-2017, 12:25 PM
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CC Member
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Join Date: Jun 2013
Location: Sacramento,
Ca
Cobra Make, Engine: Superformance, 427SO
Posts: 389
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Not Ranked
Quote:
Originally Posted by Cobra #3170
should be running by Friday in case anyone cares.
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I do !
Will you be at Good Guys in Pleasanton in June ?
Ted
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05-24-2017, 02:09 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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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
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05-24-2017, 07:46 PM
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CC Member
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Join Date: Apr 2007
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Pleasanton
Quote:
Originally Posted by Shootnride
I do !
Will you be at Good Guys in Pleasanton in June ?
Ted
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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.
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05-24-2017, 07:49 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
Posts: 1,009
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Wheels
Quote:
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
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I will measure the wheels tomorrow when I go out to garage, too tired tonight.
Old people need their sleep!
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05-25-2017, 05:52 AM
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CC Member
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Join Date: May 2007
Location: Stoke on Trent (Potteries),
UK
Cobra Make, Engine: DB427SC. 289FIA. COUPE. Round tube, Aluminium body, 427FE
Posts: 93
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Not Ranked
the Trigo FIA wheels have 1/2" more space for calipers than 427 wheels.
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05-25-2017, 06:34 AM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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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
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05-25-2017, 07:28 AM
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CC Member
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Join Date: May 2007
Location: Stoke on Trent (Potteries),
UK
Cobra Make, Engine: DB427SC. 289FIA. COUPE. Round tube, Aluminium body, 427FE
Posts: 93
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Not Ranked
Hi Mark.
Flat face to flat face:-
Trigo FIA = 3 5/16"
Trigo 427 = 2 7/8"
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05-25-2017, 08:45 AM
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CC Member
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Join Date: Dec 2012
Cobra Make, Engine:
Posts: 973
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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.
__________________
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05-25-2017, 09:31 AM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 697
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Quote:
Originally Posted by db replicas
Hi Mark.
Flat face to flat face:-
Trigo FIA = 3 5/16"
Trigo 427 = 2 7/8"
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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
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05-25-2017, 09:38 AM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
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Posts: 697
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Quote:
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.
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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
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