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 17Likes
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Post By Morris
11-16-2021, 08:12 PM
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CC Member
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Join Date: Nov 2021
Cobra Make, Engine:
Posts: 3
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Not Ranked
What would it take to put wider tires on a Cobra?
It seems one of the biggest problems with driving a Cobra is getting all that power to the ground with such a light vehicle.
One solution to this would be wider rear tires. Are there any examples of Cobras that have wider rear tires and/or are there widebody kits available?
Interested to see some fat butts.
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11-16-2021, 09:07 PM
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CC Member
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Join Date: Feb 2018
Location: Lodi,
CA
Cobra Make, Engine: 427 manowar forged crank roller rockers . BIG CAM.
Posts: 785
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Not Ranked
Need more info so all I can say is money at this point.
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11-16-2021, 09:08 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
You'd be surprised at how little difference a slightly wider tire makes. And you can get too wide and loose performance. Too wide of a tire spreads out the weight across more square mm's.
Consider making suspension changes instead.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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11-16-2021, 09:29 PM
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CC Member
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Join Date: Jan 2019
Location: Houston,
Tx
Cobra Make, Engine: UCC GT 427
Posts: 206
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Not Ranked
Wider tires will help, more important is the quality of the tires. There’s a huge difference between some pos bargain basement price tires and real high performance tires. If you’ve ever driven a car with Hoosiers racing tires on a road course, they’re like crack, the grip is unbelievable.
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11-17-2021, 05:03 AM
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CC Member
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Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,284
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Not Ranked
Wider tires will do very little. For straight line use drag radials.
__________________
Too many toys?? never!
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11-17-2021, 05:49 AM
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CC Member
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Join Date: Feb 2009
Posts: 1,695
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Not Ranked
I think there are a lot of other solutions before you go down that path. Tire type is probably the largest. If you are running BF Goodrich Radial T/A's and have 600 hp, it really isn't going to matter what width tire you buy. You are probably screwed. On the other hand, if you are running something that has a tread wear rating of 80 or so, you probably aren't having too many issues depending on what you are using the car for.
Lots of variables here and tire width to a degree isn't the highest priority.
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11-17-2021, 08:45 AM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,573
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Not Ranked
I guess I don't understand. Mine had wider rears than front. Are yours the same all the way around or are you wanting wider still?
First what can the wheels accommodate?
Second, too wide and you'll have rubbing on other pieces and parts of suspension and wheel wells.
__________________
Cheers,
Tony
CSX4005LA
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11-17-2021, 08:51 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: 18,997
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Not Ranked
Its about tire quality and less about width.
If you use a tire that is designed for cars that are twice as heavy as a Cobra they will not bite as they are street tires for modern cars.
Example: BFG's are not designed for light - short wheel based cars.
Avon's = Good
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11-17-2021, 12:40 PM
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CC Member/Contributor
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Join Date: Sep 2016
Location: (Beautiful) Sequim,
WA
Cobra Make, Engine: Pacific Roadster, 347 cu.in. 5-speed
Posts: 1,994
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Not Ranked
First off we need more info. ?? What are you using the Cobra for (Track days, Auto-X, or just a better street tire?) I purposely used my rear tire as the weakest link in the drivetrain, WAY CHEAPER to replace tires than anything else in the drivetrain. If you go with anything less than a 100 treadwear, that tire will not be a tire you want to get caught in the rain with (Racing rain tires have deep channels, sticky street tires do not). Plus your opening up a can of worms, by stressing the rest of the drivetrain, as stated. Cheers TommyRot.
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11-18-2021, 10:36 AM
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CC Member
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Join Date: May 2021
Cobra Make, Engine:
Posts: 511
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Not Ranked
Which Cobra do you have? Small block, FIA/USRRC, Daytona, narrow hip big block, or wide hip big block? If your car is one of the many many, big block replicas, it is already a wide hip. No one has ever reproduced the narrow hip Cobra, shame though!
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11-18-2021, 04:27 PM
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CC Member
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Join Date: Aug 2009
Location: Adelaide,
SA
Cobra Make, Engine: AP 289FIA 'English' spec.
Posts: 13,150
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Not Ranked
As mentioned earlier, the same weight on an increased area means less pressure on the road surface. That extra width can be a good thing ....or just the opposite.
Just remember - in cold or damp conditions, wider tyres are not your friend
Cheers!
Glen
Last edited by xb-60; 11-21-2021 at 03:12 PM..
Reason: spellin
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11-21-2021, 08:49 AM
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CC Member
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Join Date: Sep 2003
Location: San Jose,
Ca
Cobra Make, Engine: SPF #1436 514
Posts: 1,488
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Not Ranked
I have the 335 PS2 Michelins. 1st, 2nd and 3rd can still be challenging.
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11-21-2021, 09:44 AM
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CC Member
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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Not Ranked
15" i.e. 275/60/15 have better traction than 18" i.e. 345/35/18
Softer coils in the rear also help. Best to talk to a drag racer.
__________________
If I don't respond anymore, that's because I can't log in
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11-21-2021, 02:48 PM
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CC Member
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Join Date: Oct 2006
Cobra Make, Engine: Former owner of Long Live the Bow tie Contemporary #102 427 Chevy .30 over Merlin heads 11to1, TBI injection
Posts: 745
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Not Ranked
The Artnz/Butler with the super stiff X braced frame and the engine about 10 inches farther towards the rear i think really helps with handling and getting power to the ground and they could also mount a wider tire.
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01-10-2022, 12:16 PM
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CC Member
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Join Date: Jan 2005
Location: Rancho Cucamonga,
ca
Cobra Make, Engine: SPF 239
Posts: 820
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Not Ranked
How big is the question? 325/50-15 Drag Radials work great!
Last edited by D-CEL; 01-10-2022 at 12:18 PM..
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01-10-2022, 12:54 PM
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CC Member
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Join Date: May 2010
Cobra Make, Engine:
Posts: 146
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Not Ranked
Mount spray nozzles in the wheel wells. As long as you're in there, mount two separate nozzles per wheel. One for traction compound, and one for bleach. Supply tanks in the trunk.
Gives you traction, and let's you put on a show
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01-11-2022, 10:55 AM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,396
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Not Ranked
Quote:
Originally Posted by Dominik
15" i.e. 275/60/15 have better traction than 18" i.e. 345/35/18.
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Dominik....I’m surprised at your statement......let’s not steer the boys down the wrong road..... 
__________________
Morris
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01-11-2022, 02:52 PM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,687
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Not Ranked
Quote:
Originally Posted by Biggaluut
It seems one of the biggest problems with driving a Cobra is getting all that power to the ground with such a light vehicle.
One solution to this would be wider rear tires. Are there any examples of Cobras that have wider rear tires and/or are there widebody kits available?
Interested to see some fat butts.
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Years ago, I remember a tube frame Cobra with 14x32 on the rear. This was not ever a street driven car.
Bill S.
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First time Cobra buyers-READ THIS
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