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Hello all.
|UPDATED|7/15/2016 12:53:09 PM (AZT)|/UPDATED|
My 1975 C3 Coup has close to new Cooper Lifeliner Touring SLE Tires on it. 215/70R15 98T M+5.
My owner's manual says proper inflation is 20psi front and rear.
That seems way low to me.
I checked them and they were all at 29-30psi cold and the car drove like a truck. Very bumpy.
I lowered the pressure on all 4 to 21.5psi and test drove it on the freeway at 70mph and country
roads at 55mph and the vibrations and ride were much better but a litlle sloppy in turns.
Anybody have any recommendations on the best tire pressure?
I just did a google search on the subject and it sent me back here to a post from 2011...
I checked my door sticker and by golly it says 20psi front and rear.
Thanks in advance for any more infomation or experiance you might have on this.
Trent.
|UPDATED|7/15/2016 12:53:09 PM (AZT)|/UPDATED|
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7
GM went to 20 psi when they switched to radials in '73. While the ride is nice at that pressure, tire wear was uneven. I ran 32 psi for street and around 40 psi for autocross. These are 255/60-15s.
|UPDATED|7/15/2016 8:15:14 PM (AZT)|/UPDATED|
|UPDATED|7/15/2016 8:15:14 PM (AZT)|/UPDATED|
1973 L-82 4 spd
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in Forum: C3 Engines, Driveline and Handling
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