Remember, if the OEM tires were bias, and you now have radials, add three pounds to the OEM pressure to maintain the same effect.
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My 73 door sticker and owners manual says 20psi for both front and rear. That was with OEM Firestone 500 GR7015 (equal to 225 70R15 today). I used to run them a little over that at 22-24psi for better gas milage but the ride was firmer. I got over 40,000 miles out of my OEM Firestones, and sold the car at 86k with the second set of tires BFGoodrich T/A radials on it. I plan on getting the Firestone 225 R7015's and running about 25psi.
John
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One more thing, 73 was the first year for steel belted radials. The suspension was tuned for this with 20psi. When I bought the Vette New in 73, chevolet made a big deal about the advantages of the steel belted radials over the bias ply the 72 and earlier had.
John
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Thanks fellows, yes the door sticker is 20lbs, too low to me. So I try 32 up to 35 lbs see what I like,how she handles and rides.
Dave
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i have Firestone Indy 500 255/60 in the rear and 235/60 in front because they told me here that 255's in front limits the turning and requires a adjustment on endstoppers in the steering .
Problem is ofcourse i have no universal spare wheel.
Is this true on my '70 ?
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