Ron Lucero

I have Good Year F1 Eagle tires on my C5.
Front 245 45Z R17
Rear 275 40Z R18

I keep getting rear tires low. current tire pressures are front 35, rear 34. I had the sensors replaced, so i know they are good (I hope). So what is the correct tire pressures for these.

The door panel has different size tires with 30 Psi for front and back?

CQRT

Try reprogramming your sensors - - -your tires should be at 30 psi cold.

Are you sure you got the right sensors for your year/car?

Vetteman Jack

Tire pressures are supposed to be 30 psi cold front and rear. And those tire sizes are the stock sizes for the coupe/vert. The Z06 had different size tires (265-40/ZR17 and 295-35/ZR18).

Ron Lucero

Thanks for the info. I would believe that i got the correct sensors in as they were not cheap and the local Chevy dealer put them in. I will take the car back to the dealer and get it checked out.

also what would be the procedure to reprogram them anyway....

thanks for responding...

Deneb

Reprogrammed to what...? A set psi value? Or is it just reset?

jamieo

Just resets them.They are internally calibrated.

73Corvette

http://www.motor.com/article.asp?article_ID=1424

Ron Lucero

OK, so now where do i get a round magnet as shown?

Lee DeRaud

Home Depot/Lowes, Amazon, or pretty much any auto parts store.

jamieo

Or an old speaker magnet!

gulfstrings

Age old question:

Inflate to the specs provided (usually on the door end panel) by the car maker?

Or, inflate the tire to the specs provided on the tire itself?

Different answer for OEM vs. non-OEM tire?

Is there a formula out there somewhere to determine the best pressure for your car and tires?

Mickeyrx70

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The tire pressure on the door is for OEM size wheels/tires. Any other sizes, and those OEM recommendations may not apply. I checked with Michelin Customer Service for what they recommended for the 265/35-18's & 305/30 -19's Pilot Super Sports I bought 3 years ago ; they recommended 35 psi front & rear for that setup.

gulfstrings

Just had new Potenzas installed today (standard sizes) and was a little surprised on the way home: 31psi fronts/38psi rears (once warmed), numbers from sensors and confirmed with gauge once home.

Will adjust tomorrow when hot to 34 psi for all tires but curious why installer went with these pressures.

Lee DeRaud

Whatever pressure it took to seat the bead, I imagine.
I always check/adjust before I drive home from the tire place.

grantv

I don't think any tire shop has ever set my pressures correct. Always check the first place I find on the way home.

65GGvert

I think you're wasting your time reprogramming. All that does is set the frequency for each sensor to match your car and the order you program determines it's position on the car. If you're getting readings, reprogramming won't make it read any different. You should not get low readings unless you drop below 25psi. I'd verify the actual pressure with an accurate gauge first. If you're using the dash gauge only, you won't know the actual pressure until you verify.
When you get "low pressure" what pressure does you dash show? You should never get that warning with any pressure over 25psi. If you're using a digital gauge to verify, make sure it's on psi. I'm not sure if it changes the tire pressure readouts, but also make sure your English/metric button is set to English.

Mickeyrx70

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When I contacted them, I told them my Make/Model/Year & the OEM size tires/recommended tire pressure. What you suggest makes sense, but I really don't know exactly how a manufacturer decides. I just wanted Michelin's input. I'm actually using 32-33 cold and I like the ride/fuel economy at that point. As far tread wear, the tires will probably age-out before the tread wears out.

mrlmd

Tire manufacturers and dealers will give you a recommended tire pressure designed for maximum tread life and long life of the tire - most of the time much higher than recommended on the door by the auto manufacturer, and in many times, up to the max or close to the max for the tire. The auto manufacturer on the other hand is giving you a tire pressure recommendation for quality of ride and maybe "handling". So it's always a compromise between the two, and with so many different tires, how can the auto manufacturer make a blanket recommendation for all the tires out there? What they are really telling you is the setup for the OEMs that come stock with the car. I personally like my tires inflated maybe 2 lbs. higher than the recommendation on the door, I like the ride and handling and tread life better. You pay your money and take your choice. Just because it is written on the label on the door, that does not make it law or infallible. Everyone is modifying tires, brakes, suspensions, engines, etc, so you adjust it as you feel best.

Lee DeRaud

Interesting. I'm running very close to that: 32F/30R on stock-size Hankooks.
Just about every car I've ever owned feels a bit crisper around town with 2PSI extra in front...I wasn't at all surprised that the C5 does too.