Correct tire pressure?
#1
Correct tire pressure?
Hi Guys,
I just put on a re-painted set of ‘69 15X7 SSIII wheels with Cooper Cobra Radial 245/60R-15 tires on my ‘68 Cutlass. I have a slow leak in one tire, so I have to get that fixed, but when I was checking the pressure of the other 3 tires they were all over the place. I looked at my service manual and it says the proper pressure is 24 PSI but that seems pretty low. The tire itself says that the max pressure is 44 PSI. What is the correct pressure?
I just put on a re-painted set of ‘69 15X7 SSIII wheels with Cooper Cobra Radial 245/60R-15 tires on my ‘68 Cutlass. I have a slow leak in one tire, so I have to get that fixed, but when I was checking the pressure of the other 3 tires they were all over the place. I looked at my service manual and it says the proper pressure is 24 PSI but that seems pretty low. The tire itself says that the max pressure is 44 PSI. What is the correct pressure?
#2
The pressue decal in the car is for tire styles available in 1969, not modern radial tires.
The pressure on the tire sidewall is the maximun pressure at the maximum load rating.
So in reality modern radial tires on your car should be inflated to somewhere in the 30-36 psi range. I have similar tires and run them at 35 psi.
FYI, there were no 15x7 SSIII wheels in 1969. They may be 74-77 wheels.
The pressure on the tire sidewall is the maximun pressure at the maximum load rating.
So in reality modern radial tires on your car should be inflated to somewhere in the 30-36 psi range. I have similar tires and run them at 35 psi.
FYI, there were no 15x7 SSIII wheels in 1969. They may be 74-77 wheels.
Last edited by Fun71; August 16th, 2020 at 05:07 PM.
#3
The pressue decal in the car is for tire styles available in 1969, not modern radial tires.
The pressure on the tire sidewall is the maximun pressure at the maximum load rating.
So in reality modern radial tires on your car should be inflated to somewhere in the 30-36 psi range. I have similar tires and run them at 35 psi.
FYI, there were no 15x7 SSIII wheels in 1969. They may be 74-77 wheels.
The pressure on the tire sidewall is the maximun pressure at the maximum load rating.
So in reality modern radial tires on your car should be inflated to somewhere in the 30-36 psi range. I have similar tires and run them at 35 psi.
FYI, there were no 15x7 SSIII wheels in 1969. They may be 74-77 wheels.
#9
#10
What I do is interpolate between the spaced-one-micron-apart “32" mark and “33" mark on the fits-in-your-shirt-pocket 0-500 psi pressure gauge I bought with my paper-route earnings two-for-39 cents (I gave one to my Dad) out of the markdown bin at Key Drug Store in Rochester, New York in 1968. That drug store chain went out of business (or was bought out by CVS or something) in the 1980s, but I still have the gauge!
Last edited by jaunty75; August 17th, 2020 at 04:38 PM.
#14
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