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-   -   Upgrading rear tyres and wheels (http://www.clubcobra.com/forums/australian-cobra-club/114222-upgrading-rear-tyres-wheels.html)

Baz 02-02-2012 01:20 PM

Upgrading rear tyres and wheels
 
At the moment, I have two 315x35x17" Sumitomos on 10 1/2" x 17" Vintage Pin Drive rims which have only done 2,500 k's fitted to the rear of my Cobra. I am considering changing the look of my car to get a more beefy appearance in the rear wheel department by fitting 295x50Rx15" B.F. Goodrich Radial T/A 's tyres to new 10 1/2" x 15" Vintage Pin Drives.

I am seeking expressions of interest from anyone who might be interested in purchasing the two 315's on 17" Vintage Knock Offs for $1,000. That price is for the rim and tyre only and does not include the Adapters or Spinner Kit.


Regards

Baz

xb-60 02-02-2012 01:55 PM

That's a good way to go Baz. IMO, the 15" wheels will look great....very period correct, and as you say, "beefy". Worth doing.
Cheers,
Glen

Modena 02-02-2012 01:57 PM

Baz what is the offset, the stud pattern, and the centre hole diameter?

Tenrocca 02-02-2012 02:32 PM

What about the fronts Baz?

Donunder 02-02-2012 03:54 PM

Baz have you considered these instead of the BFGs?
Mickey Thompson Performance Tires & Wheels

Rebel1 02-02-2012 04:11 PM

There is also this tyre as an option:

CooperTiresConsumer - Cobra Radial G/T™

boxhead 02-02-2012 05:42 PM

There is only 1 choice.

Has to be BillBoards.

Baz 02-02-2012 05:58 PM

Quote:

Originally Posted by Tenrocca (Post 1173847)
What about the fronts Baz?

Hi Andrew,

I am leaving the 17's and the Sumo's on the front. I'm quite haoppy with the appearance in that area and also their grip isn't too bad either.


Baz

Aussie Mike 02-02-2012 06:18 PM

Are you going for 15's for drag racing? Those TA's may not be the best choice. Maybe look at some drag radials. BF Goodrich make some with tread.

Cheers

Merv and Sharon 02-02-2012 06:24 PM

Baz, will your brake and callipers fit into the reduced space of the 15" wheel?

Baz 02-02-2012 06:39 PM

Quote:

Originally Posted by Modena (Post 1173841)
Baz what is the offset, the stud pattern, and the centre hole diameter?

Hi Modena,

Thanks for your interest. I have changed my mind after some advice on a PM. I have been recommended a set of Goodyear 285x40x17 GS-D3's for the rears which have a much higher wall height and just what I am looking for. This way, I don't have to buy a new set of 15" rims and end up with the look that I am after.

Thanks everyone for their interest.


Baz

Shelby400 02-02-2012 06:41 PM

Hey Baz
Any new pics of your car? Haven't seen any since you finished it.

Wazza 02-02-2012 07:08 PM

Quote:

Originally Posted by Baz (Post 1173896)
Hi Modena,

Thanks for your interest. I have changed my mind after some advice on a PM. I have been recommended a set of Goodyear 285x40x17 GS-D3's for the rears which have a much higher wall height and just what I am looking for. This way, I don't have to buy a new set of 15" rims and end up with the look that I am after.

Thanks everyone for their interest.


Baz

Hey Baz...
You might want to re-check that ....
I'm pretty sure that the "Wall Height" on the Sumitomos will work out to be 110.25 mm , and the GS-D3 Goodyears to be 114 mm....
That's only a "flea's doodle" difference !

Aren't the "Middle numbers" ......e.g. 315/35/17...and 285/40/17... on all of the tyres sizes a "percentage" of the width ?

i.e. 315 X 35% = 110.25mm
285 X 40% = 114.00mm

Difference in "Wall Height" = 3.75mm ( 15/100ths of an inch )

Have I got this wrong ??


Cheers,
Warren.

boxhead 02-02-2012 07:26 PM

You have it 100% correct Wazza (as if you doubted yourself)

Merv and Sharon 02-02-2012 08:07 PM

Yep. I have the 285 40s in Sumitomo.

Aussie Mike 02-02-2012 08:31 PM

Are you still running round eith rego height suspension? Dropping it a couple of inches front and bsck will make the tyres fill the guards much better. Probably make it handle better too. Mine was pretty horrible with the suspension wound up both in looks and ride.

Just make sure your tyres clear the edges of the guards. From my memory of your build pics your wheel offsets put the tyres out near the lip. You wouldnt want one to rub and stuff up your nice paint. Thats one of the reasons i didnt paint mine before driving it. Ive found a few spots where the tyres rub and fixed them now.

Cheers

Baz 02-02-2012 08:40 PM

Quote:

Originally Posted by Aussie Mike (Post 1173924)
Are you still running round eith rego height suspension? Dropping it a couple of inches front and bsck will make the tyres fill the guards much better. Probably make it handle better too. Mine was pretty horrible with the suspension wound up both in looks and ride.

Just make sure your tyres clear the edges of the guards. From my memory of your build pics your wheel offsets put the tyres out near the lip. You wouldnt want one to rub and stuff up your nice paint. Thats one of the reasons i didnt paint mine before driving it. Ive found a few spots where the tyres rub and fixed them now.

Cheers

Thanks Mike. Everything fits just right now.

Baz

Baz 02-02-2012 08:45 PM

Quote:

Originally Posted by Wazza (Post 1173903)
Hey Baz...
You might want to re-check that ....
I'm pretty sure that the "Wall Height" on the Sumitomos will work out to be 110.25 mm , and the GS-D3 Goodyears to be 114 mm....
That's only a "flea's doodle" difference !

Aren't the "Middle numbers" ......e.g. 315/35/17...and 285/40/17... on all of the tyres sizes a "percentage" of the width ?

i.e. 315 X 35% = 110.25mm
285 X 40% = 114.00mm

Difference in "Wall Height" = 3.75mm ( 15/100ths of an inch )

Have I got this wrong ??


Cheers,
Warren.

Thats right Warren, but the Goodyears are half an inch larger in the overall diameter which is what I'm after.

Baz

Aussie Mike 02-02-2012 08:52 PM

1/2" is going to be hard to pick as it's only 1/4" top and bottom. I think they will just appear to look bigger because they have a taller sidewall. The gap to the guards will be about the same.

Cheers

Gav 02-02-2012 09:08 PM

The larger tyres will throw your speedo out Baz, along with the tune for your shift points in the auto.
Just a thought.


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