Air Pressure
Race Director
Joined: Nov 2006
Posts: 13,258
Likes: 7,847
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
For best ride quality you would run them a bit on the low side.
That said, it does matter to some degree which tires you are running.
Myself, running 255/60-15's for over 35 years and a couple different brands have always run 32 PSI all the way around and have gotten excellent tread wear and decent handling.
Perhaps around 30 PSI for best ride quality would be a good starting point.
That said, it does matter to some degree which tires you are running.
Myself, running 255/60-15's for over 35 years and a couple different brands have always run 32 PSI all the way around and have gotten excellent tread wear and decent handling.
Perhaps around 30 PSI for best ride quality would be a good starting point.
Advanced
Joined: Apr 2008
Posts: 63
Likes: 31
From: iowa
2025 C3 ('68-'73) of the Year Finalist - Unmodified
I have a '79. Running Cooper Cobras, 255/60-15. Factory door sticker states: Cold Air Pressure/ 30lbs front - 35lbs rear.
For best fuel economy: 20lbs front - 26lbs rear. I run 28lbs all around and like the ride I'm getting.
I have also rebuilt the entire suspension which made a heck of difference in ride and handling. Good luck.
For best fuel economy: 20lbs front - 26lbs rear. I run 28lbs all around and like the ride I'm getting.
I have also rebuilt the entire suspension which made a heck of difference in ride and handling. Good luck.
Burning Brakes
Joined: Nov 2014
Posts: 951
Likes: 215
From: Foothills of the Adirondacks.
I like to run closer to 40 psi. Better handling.
Thread Starter
Heel & Toe
Joined: Aug 2024
Posts: 19
Likes: 3
From: N.E. Pa.
Good tire choice.
I like to run closer to 40 psi. Better handling.
https://www.youtube.com/watch?v=EftZ1BCr5uA
I like to run closer to 40 psi. Better handling.
https://www.youtube.com/watch?v=EftZ1BCr5uA
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Verdad Gallardo
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Depends on the tires used. But, 30 psi is a good place to start. Go no lower, unless you KNOW that the tires you have are capable of such lower pressure.
P.S. When radial tires first made it to Corvettes (mid-70's) the GM engineers mistakenly thought that wide tires should have less pressure and actually spec'd them for mid-20 psi levels. BIG MISTAKE!! Lots of tire failures from over-flexing the sidewalls.
The Owner's Manuals for those cars and some tire pressure sticker repro's still call out those low pressures. DO NOT DO SO.
P.S. When radial tires first made it to Corvettes (mid-70's) the GM engineers mistakenly thought that wide tires should have less pressure and actually spec'd them for mid-20 psi levels. BIG MISTAKE!! Lots of tire failures from over-flexing the sidewalls.
The Owner's Manuals for those cars and some tire pressure sticker repro's still call out those low pressures. DO NOT DO SO.
Race Director
Joined: Nov 2006
Posts: 13,258
Likes: 7,847
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
those tire pressure labels from 45/50 years ago were terrible when new and considering tires have evolved a great deal in over 40 years.......