NSW Corvettes

Technical Tips => Brakes, Suspensions, Steering, Wheels & Tyres => Topic started by: 72C3 on January 09, 2013, 02:05:22 PM

Title: Tyre pressures
Post by: 72C3 on January 09, 2013, 02:05:22 PM

My 72 has Goodyear eagles, 245/65/15's (I think) on it.  What is the recommened pressure for these tyres.  The tyre placard does not cater to these types of tyres.

Title: Re: Tyre pressures
Post by: anychevy on January 09, 2013, 02:24:59 PM

I would put at least 30-35psi all round, depending on driving style and comfort.

Title: Re: Tyre pressures
Post by: 77CVT on January 10, 2013, 01:10:54 PM

 :agree:

I think the factory recommended pressure would be around 28psi.  Pretty much all manufacturers recommended pressures 5-8 psi below optimum efficiency / performance due to comfort.

I run at least 30-35 on a C3 depending on the age of the tyre.  I wouldn't put a lot of pressure in an 8 year old tyre.  If they are new just go by the max pressure on the sidewall.

Title: Re: Tyre pressures
Post by: 72C3 on January 10, 2013, 10:01:51 PM

Heres the issue.  Just importd the car, tyres look brand new but the date stamp says they were made in 98.  Rubber is hard as a rock and I am not game to take it anywhere where it is going to rain .

Title: Re: Tyre pressures
Post by: 77CVT on January 11, 2013, 10:03:16 AM

Like 90% of C3's out there!   :wink:  (including mine!)

I'd put 30 psi in....and don't drive it in the rain. 

 :cheers:

Title: Re: Tyre pressures
Post by: StephenSLR on January 11, 2013, 11:02:55 AM

Quote from: 77CVT on January 10, 2013, 01:10:54 PM

just go by the max pressure on the sidewall.

The max. pressure on the sidewall isn't a good indicator of what you should inflate them to, it's the suggested max. pressure for the tyre itself.

The pressure you want depends on your car hence why manufacturers suggest tyre pressures, they take into account the weight, suspension, etc. and what tyres they did all the tests on.

Since new tyre compounds have been invented since your car was produced, you can inflate to the tyre's max. pressure then adjust it according to your driving style, it will probably feel right somewhere between the manufacturer's suggested pressure and the max. pressure of the tyre.

s