BPHORSEGUY

I run GOODYEAR EAGLE GT 255/60 stock tires. My manual says 20psi front and 26 psi rear and that you can add 4 psi for "TURNPIKE" driving so that makes 24psi front and 30 psi rear. This is a 1977 manual and seems way low to me. Were tires different then or just roads and speeds? What do you all use on those vintage size tires??

Timsride

The side of the tire should give You a maximum air pressure. I would set it close to that.

7T1vette

Forget what a 1970's owner's manual says about tire pressures. Your tires are of completely different construction and materials than original vehicle rubber. Query the Goodyear website for correct tire pressures with your tire sizes and vehicle weight. My guess is that fronts should be around 30 psi and rears around 28...but that's just a guess.

Patrick73

jb78L-82

Correct recommendation from previous comments about tire technology is way different today than in 1977 BUT unfortunely, a Goodyear Eagle GT 255/60/15 from 1977 is not that different than today's Goodyear ST, BFG Radial T/A, or a Dunlop GT Qualifer (all S/T rated tires similiar to the OEM Goodyear GT. S/T rated tires are speed rated to 112/118MPH and generally carry a maximum pressure rating of 36 PSI. V/Z rated tires are generally rated for 149/168/ 186 MPH and carry a maximum PSI rating of either 44 or 52 PSI. I currently run 255/45/17 ZR's (40 PSI) on my 78 since the tires are far superior to the S/T rated tires in terms of ride, steering response, and handling. I have had all the OEM tires mentioned above and ran 32 PSI on all 4 of them. I would run the maximum pressure that you can tolerate in terms of ride for the best longevity and steering response (not much from any S/T rated tire). Hope that helps!

SanDiegoPaul

Never run tires at max pressure! When you drive it they are going to be wayyy overinflated.