Tire Pressure
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Joined: Jul 2013
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From: Florida
Tire Pressure
Hi Everyone,
I just mounted Coker FR7015 Wide Oval Tires for my 72 and was wondering if anyone knows what tire pressure I should run.
The original F7015 Bias ply tire pressure was 25 psi but that doesn't sound right for a radial tire.
Any help would be appreciated
I just mounted Coker FR7015 Wide Oval Tires for my 72 and was wondering if anyone knows what tire pressure I should run.
The original F7015 Bias ply tire pressure was 25 psi but that doesn't sound right for a radial tire.
Any help would be appreciated
Advanced
Joined: Mar 2018
Posts: 83
Likes: 14
From: Maine
GM recommended tire pressure 1976 to 1978 for GR70-15 Tires is 20 PSI front 26 PSI rear.
The pressure you use is really a personal decision and will depend on how you want your car to handle and what type of ride you prefer (stiff or soft). 25 psi should be fine if you are happy with the ride and handling. I run 2 psi less pressure in the front tires than in the rear.
The pressure you use is really a personal decision and will depend on how you want your car to handle and what type of ride you prefer (stiff or soft). 25 psi should be fine if you are happy with the ride and handling. I run 2 psi less pressure in the front tires than in the rear.
Had a 1976 L-82, 4-sp
Joined: Mar 2011
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From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Whatever pressure you choose, check for tire wear regularly with a tread depth gauge and adjust pressure accordingly.
Advanced
Joined: Oct 2009
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Tirepressure advice is to give the tire a deflection that wont overheat them riding the speed for wich it is determined.
A diagonal tire needs lower pressure for lower loads then radial tires.
but often the advice is given for fully loaded and maximum technical car speed.
99% of use is with lower axle loads then gross axleweight ratings and max speed used also .
this probably compensates the higher pressure because of radial vs diagonal.
Me as " pigheaded Dutch selfdeclared tirepressure-specialist" can calculate a save pressure for you.
Need weigts, used speed and tirespecifications for it.
A diagonal tire needs lower pressure for lower loads then radial tires.
but often the advice is given for fully loaded and maximum technical car speed.
99% of use is with lower axle loads then gross axleweight ratings and max speed used also .
this probably compensates the higher pressure because of radial vs diagonal.
Me as " pigheaded Dutch selfdeclared tirepressure-specialist" can calculate a save pressure for you.
Need weigts, used speed and tirespecifications for it.
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From: Southern Cal Ca
St. Jude Donor '22
interesting that fronts are being suggested to be less than rear.
i found on 225/70/15 radial, that rears show over inflation
when run same as fronts.
cold 32 front and 28 rear has even wear.
i found on 225/70/15 radial, that rears show over inflation
when run same as fronts.
cold 32 front and 28 rear has even wear.
Burning Brakes
Joined: Dec 2005
Posts: 1,164
Likes: 224
From: Pawleys Island, SC
I ran my 225/70/15 BFGs at 24FR/26RR PSI for many years with no problem. (The door panel specified 22PSI front resulted in a bit too much tire squealing.) Good handling, comfortable ride. Once I went to 255/60s I noted big increase in turning effort at those pressures. I then went to 30PSI FR & RR.
Last edited by revitup; Apr 15, 2018 at 02:20 PM.
Thread Starter
Pro
Joined: Jul 2013
Posts: 729
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From: Florida
Tirepressure advice is to give the tire a deflection that wont overheat them riding the speed for wich it is determined.
A diagonal tire needs lower pressure for lower loads then radial tires.
but often the advice is given for fully loaded and maximum technical car speed.
99% of use is with lower axle loads then gross axleweight ratings and max speed used also .
this probably compensates the higher pressure because of radial vs diagonal.
Me as " pigheaded Dutch selfdeclared tirepressure-specialist" can calculate a save pressure for you.
Need weigts, used speed and tirespecifications for it.
A diagonal tire needs lower pressure for lower loads then radial tires.
but often the advice is given for fully loaded and maximum technical car speed.
99% of use is with lower axle loads then gross axleweight ratings and max speed used also .
this probably compensates the higher pressure because of radial vs diagonal.
Me as " pigheaded Dutch selfdeclared tirepressure-specialist" can calculate a save pressure for you.
Need weigts, used speed and tirespecifications for it.
weight of car plus 280 pounds passengers tires are Coker FR7015 basic round town speed 35-45 very rare highway at 65
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Joined: Jul 2013
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From: Florida
Thread Starter
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Joined: Jul 2013
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From: Florida
Racer
Joined: Oct 2015
Posts: 414
Likes: 407
From: Meadville Pennsylvania
This subject has been debated to death on many occasions on CF. For what it is worth the best advise will come from Coker or the tire manufacturer. On my 75 I am running Cooper Cobras 235-70-15 at 32 psi front and back. I have what I think is very good handling and a fairly smooth ride. Don't be afraid to experiment a little but if Coker has warranted the tires, their inflation recommendation is law.
Jerry
Jerry
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Joined: Jul 2013
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From: Florida
Hi Everyone,
I've put about two hundred miles on the Coker FR70x15 wide ovals and wanted to give everyone an update the performance of the tires met and exceeded my expectations.
The car rides and handles great and when I first put them on the car the way they looked was awesome to me it actually made the car look like it was back in the 70's.
Also wanted to thank everyone again for their help.
I've put about two hundred miles on the Coker FR70x15 wide ovals and wanted to give everyone an update the performance of the tires met and exceeded my expectations.
The car rides and handles great and when I first put them on the car the way they looked was awesome to me it actually made the car look like it was back in the 70's.
Also wanted to thank everyone again for their help.