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05-13-2010, 03:06 PM
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CC Member
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Join Date: Mar 2010
Location: Williamsburg,
VA
Cobra Make, Engine: SPF #2920 w/ Keith Craft 408
Posts: 250
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Not Ranked
15 inch tire sizes
Just put a deposit on a SPF. It currently has 255/60 x 15 fronts and 275/60 x 15 rears. The dealer is willing to change tire sizes.
I see a lot of 295/50 x 15s in back.
Assume the 275/60 x 15s rears will make the car feel slightly more responsive and lively (especially in mild turns)?
Assume the 295/50 x 15s will grip slightly better in straight line?
Engine will be a KCR 408 street crate motor.
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05-13-2010, 03:50 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
What brand of tires are on the car? Would you be switching to the same brand, but in a different size? Unfortunately, there aren't that many choices out there.
I like the look of the 295's in the back, but I'm not sure you're going to see a significant change in performance between the two.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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05-13-2010, 03:54 PM
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CC Member
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Join Date: Sep 2003
Location: WEST SUBURBS OF CHICAGO,
IL
Cobra Make, Engine: SPF 1454
Posts: 1,137
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Not Ranked
I'm currently running the 295/50's and will be changing to the 275/60's. They just look a little better (taller). The 295's just look a tad too short.
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CHRIS
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05-13-2010, 04:16 PM
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CC Member
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Join Date: Mar 2010
Location: Williamsburg,
VA
Cobra Make, Engine: SPF #2920 w/ Keith Craft 408
Posts: 250
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Not Ranked
Both sizes will be BFG radial T/As. I’m guessing nothing more than just decent handling & hookup.
I have 3 sets if tires, mounted on different rims for my supercharged Miata. Swapping back and forth gives me completely different handling characteristics. The fat, sticky tires are best for auto crossing, but the middle sized tires give me the best feel for carving the back roads.
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05-13-2010, 04:49 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
Go with the Avon's, if you want to stick with a radial tire.
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John Hall
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05-13-2010, 06:06 PM
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Club Cobra Member
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Join Date: Nov 1999
Location: Salem,,
NJ
Cobra Make, Engine: ERA 289 FIA #2100 Rio Red Wimbledon White Stripes 302 stroked to 331 Webers Richmond Road Race 5 speed
Posts: 782
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Not Ranked
Try Mickey Thompson tires.
__________________
 Snakebit
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05-13-2010, 06:19 PM
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CC Member
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Join Date: Dec 2006
Cobra Make, Engine: CSX 4000; Shelby aluminum FE with 58mm IDAs
Posts: 1,116
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Not Ranked
Quote:
Originally Posted by Voyager
Both sizes will be BFG radial T/As. I’m guessing nothing more than just decent handling & hookup.
I have 3 sets if tires, mounted on different rims for my supercharged Miata. Swapping back and forth gives me completely different handling characteristics. The fat, sticky tires are best for auto crossing, but the middle sized tires give me the best feel for carving the back roads.
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The Radial T/As are not a good tire for Cobras (some suggest they are downright dangerous--due to lack of traction). I suggest you consider upgrading your tires to Avons, Billboards, or drag radials (one of the best performance upgrades you can make to your car). |
05-13-2010, 09:13 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
Anything but BFGs. They last forever but they are not too sticky. They're not very round either.
Bob
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05-14-2010, 11:17 PM
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CC Member
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Join Date: Feb 2003
Location: Puyallup Wa.,
wa.
Cobra Make, Engine: Superformance Cobra #1628, Coast Performance Stroker 427W Ford 520HP/535FT.TQ, Blue with white stripes
Posts: 830
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Not Ranked
I like the look of the 275/60/15 better then the 50 series. I have gone through 2 sets of BFG's and have also tried the Yokahama's. I would buy the YOKI's of the BFG's for the reasons already stated before. That being said...I am running 17's and the 15's are sitting in the garage.
Jake
__________________
If your going to dream, dream big!
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05-15-2010, 06:24 AM
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CC Member
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Join Date: Mar 2010
Location: Williamsburg,
VA
Cobra Make, Engine: SPF #2920 w/ Keith Craft 408
Posts: 250
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Not Ranked
I like the look of the Billboards, however, I found a fair amount of negative comments about them in the tire forum. Seems hit and miss on QC?
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05-15-2010, 02:18 PM
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CC Member
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Join Date: Feb 2010
Location: Paris,
IL
Cobra Make, Engine: Superformance #2675
Posts: 13
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Not Ranked
Rather than dwell on tire sizes, it is more important as to brand of tires. I switched my stock SFD for M/T street radials and went with 235's (smaller) in the front and 275/50's in the rear and completely changed my car. Could not believe the difference. The car handles completely predictable in the corners and sticks like glue. Even the steering feels better.
My stock Yoko's were as hard as a rock and even with 20# pressure, they are gone gone gone....
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