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Topic: C3 Tire Pressure

in Forum: C3 Handling Components

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C3 Tire Pressure (1/3)
7/15/16 3:53pm

Trent
Limited Member
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Bellefontaine, OH - USA

Vette(s):
1975 L-48 4spd Bright Blue tilt/tele/cruise/pw/Holly Carb.

Joined: 10/2/2014
Posts: 22

Hello all.

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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Re: C3 Tire Pressure (2/3)
7/15/16 11:15pm

73shark
Limited Member
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 866

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|

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1973 L-82 4 spd

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Re: C3 Tire Pressure (3/3)
7/18/16 8:15pm

Trent
Limited Member
Send Private Message

Bellefontaine, OH - USA

Vette(s):
1975 L-48 4spd Bright Blue tilt/tele/cruise/pw/Holly Carb.

Joined: 10/2/2014
Posts: 22

73Shark,

Thanks for the information.

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