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 4Likes
06-29-2016, 06:01 AM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
FIA Tire Size
I'm buying new tires for #2049. It currently has 295/50-15 (rear) and 235/60-15 (front).
I have the rears already, but what is ideal for the front?
235/60-15....current set up
235/65-15....fill the well up a bit more?
Something else?
Thanks
__________________
"Some things get meaner as they get older."
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06-29-2016, 06:33 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,021
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Not Ranked
The difference in diameter is almost +1". That means the car will have to be lowered in the front ~1/2" and you will lose 1" at the top of the tire. Do you have the clearance?
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06-29-2016, 07:46 AM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
Bob,
I'll post a picture I have...it will be later today after work. Thanks
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"Some things get meaner as they get older."
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06-29-2016, 07:58 AM
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CC Member
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Join Date: Dec 2012
Cobra Make, Engine:
Posts: 973
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Not Ranked
I would go with what you have now in regards to sizing. Your car appears to sit "just right" to me. FIA cars do have a different stance/tire to fender clearance than a street 427.
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06-29-2016, 08:10 AM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
I doesn't even look like Avon does a 235...
225/60-15 or 225/65-15
__________________
"Some things get meaner as they get older."
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06-29-2016, 08:22 AM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
Quote:
Originally Posted by 66gtk
I would go with what you have now in regards to sizing. Your car appears to sit "just right" to me. FIA cars do have a different stance/tire to fender clearance than a street 427.
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Good point, thank you. So they have more of a rake...bit higher in the back?
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"Some things get meaner as they get older."
Last edited by 427 Street; 06-29-2016 at 08:24 AM..
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06-29-2016, 11:16 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,527
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Not Ranked
I'm really outside the norm in that I went with 215/70-15 on the front and 255/60-15 on the back. Both are a just shy of 27 inches tall and fill the wheel wells fairly well. I had to shave the rear of the left front wheel lip down at the rocker slightly to get the front ones to clear.
Tires and Wheels |
06-29-2016, 11:38 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: 19,051
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Not Ranked
I run the Power cushion up front, small yet tall. G7 in the rears.
Well balanced but not the best for track.
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06-29-2016, 02:44 PM
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CC Member
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Join Date: Sep 2008
Location: Austin,
TX
Cobra Make, Engine: ERA FIA, 351W
Posts: 765
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Not Ranked
So we are talking AVONs right?
I believe it's 225/65/15 for the front - that's what I had up there before I switched to MT's recently; no 235 size; I hear that people have gotten away with 245s in the front but some or all have clearance issues.
btw, the MT S/Rs I got for the front fit better than the Avons: 26x10x15s fill the wheel-wells better and sit a bit lower.
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06-29-2016, 02:46 PM
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CC Member
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Join Date: Sep 2008
Location: Austin,
TX
Cobra Make, Engine: ERA FIA, 351W
Posts: 765
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Not Ranked
is 2049 the blue one (with no stripe out of CT)?
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06-29-2016, 09:42 PM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
Quote:
Originally Posted by fastd
is 2049 the blue one (with no stripe out of CT)?
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That's the car...
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"Some things get meaner as they get older."
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06-30-2016, 05:56 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,021
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Not Ranked
Quote:
Originally Posted by 427 Street
I doesn't even look like Avon does a 235...
225/60-15 or 225/65-15
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The latter. See Tire selection |
06-30-2016, 07:35 AM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
That answered my question Bob...perfect. Thank you.
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"Some things get meaner as they get older."
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07-12-2016, 07:54 PM
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CC Member
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Join Date: Oct 2012
Location: Burbs,
IL
Cobra Make, Engine: ERA #472, Previous owner of ERA #677 427, ERA 289 FIA-USRRC Street
Posts: 221
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Not Ranked
Well, not the best picture....just a quick one with my phone.
Avons installed...
Front: 225/65-15
Rear: 295/50-15
This is the same set-up I had on my 427 street car. Thanks again to Nick Acton.
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"Some things get meaner as they get older."
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07-12-2016, 09:51 PM
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CC Member
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Join Date: Jun 2001
Location: Mesa,
AZ
Cobra Make, Engine: ERA #2119 289FIA
Posts: 5,380
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Not Ranked
I'm happy with my 10.26.15 fronts and 12.26.15s in the rear. My FIA has a little bit of a nose-up attitude, veddy British-ish.
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Karlos
"In the Land of the Pigs, The Butcher is King"
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07-13-2016, 12:36 PM
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CC Member
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Join Date: Sep 2008
Location: Austin,
TX
Cobra Make, Engine: ERA FIA, 351W
Posts: 765
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Not Ranked
427 Street
Looks so good...
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12-28-2016, 07:45 PM
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CC Member
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Join Date: Aug 2008
Location: Tahoe/Truckee,
ca
Cobra Make, Engine: Ford Racing 363/8-stack injection, SPFR0012
Posts: 260
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Not Ranked
Quote:
Originally Posted by 427 Street
Well, not the best picture....just a quick one with my phone.
Avons installed...
Front: 225/65-15
Rear: 295/50-15
This is the same set-up I had on my 427 street car. Thanks again to Nick Acton.
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With the sizes you run, how is the balance. Our application is for an FIA MK2.
Thanks
Mark |
12-29-2016, 03:00 AM
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CC Member
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Join Date: Jan 2004
Location: Queanbeyan,
NSW
Cobra Make, Engine: AP 289 USRRC #98 The Ken Miles Tribute Car
Posts: 1,134
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Not Ranked
Tyres
Running 245/60/15 on front, 295/50/15 rear Avons on this FIA build.
Cheers
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289 FIA Cobras RULE! 
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12-29-2016, 05:45 AM
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CC Member
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Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,505
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Not Ranked
Thanks for that information. I am trying to figure out which tires to run on my 289 FIA SPF/Riverside Racer. The racing organization that I will run with is specific about tires and sizes. I am going to go with Hoosier Street TD's and the sizes that I am allowed are: 225/60/15, 245/60/15, 275/60/15, 25.5/8.5/15 or 26.5/9.5/15
I am a little concerned about having adequate clearance, and also wanting to make sure that I have adequate rubber on the track. 245 seems way to small for the back, especially given that the 289 will have approximately 450HP at the flywheel.
Any thoughts? I am starting to lean towards 25.5/8.5/15 in the front and 26.5/95/15 in the rear, as they are a little less tall and slightly wider. that will help lower my center of gravity a little and increase grip. The car has transverse leaf springs, so lowering height means placing lowering blocks over the leaf springs.
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12-29-2016, 09:33 AM
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CC Member
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Join Date: Jan 2016
Posts: 498
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Not Ranked
Quote:
Originally Posted by 1795
Thanks for that information. I am trying to figure out which tires to run on my 289 FIA SPF/Riverside Racer. The racing organization that I will run with is specific about tires and sizes. I am going to go with Hoosier Street TD's and the sizes that I am allowed are: 225/60/15, 245/60/15, 275/60/15, 25.5/8.5/15 or 26.5/9.5/15
I am a little concerned about having adequate clearance, and also wanting to make sure that I have adequate rubber on the track. 245 seems way to small for the back, especially given that the 289 will have approximately 450HP at the flywheel.
Any thoughts? I am starting to lean towards 25.5/8.5/15 in the front and 26.5/95/15 in the rear, as they are a little less tall and slightly wider. that will help lower my center of gravity a little and increase grip. The car has transverse leaf springs, so lowering height means placing lowering blocks over the leaf springs.
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in the main european historic races e.g. lemans classic and tour auto the tires are limited to front 215/70R15 and rear 245/60R15 (avon cr6zz)
Last edited by peterpjb; 12-29-2016 at 09:35 AM..
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