40# recommended tire pressure?
Thread Starter
Advanced
Joined: Aug 2003
Posts: 83
Likes: 0
From: Larkspur CO
40# recommended tire pressure?
Took the C5 in for an alignment today and the tech told me I was crazy to put in 30psi cold. He has been around many years and his alignments are the best I have ever found. He claims 40psi will give me longer tread wear (which is cool with me). I am confused and am turning to my brethren of the forum. Any feedback greatly appreciated!
I am running stock runflats.
I am running stock runflats.
Drifting
Joined: Jul 2002
Posts: 1,890
Likes: 1
From: Indiana
St. Jude Contributor
I've usually run about 30 cold in my OEM Goodyears............37K miles and the fronts are good for another 5 or 6. Replacing all 4 soon though.
If they drop to 27 or 28 in cold weather.........I don't add.......they warm up pretty quick to 30
If they drop to 27 or 28 in cold weather.........I don't add.......they warm up pretty quick to 30
Le Mans Master
Joined: Mar 2002
Posts: 7,179
Likes: 1
From: Honolulu Hawaii
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Originally Posted by lvvette777
I hope you have a good dental plan because you will be jarring your teeth out at 40 psi.
Veteran
Joined: Jan 2000
Posts: 2,082
Likes: 1
From: Louisville KY
Originally Posted by mowton
40 at cold translate to +45 at temp; If I'm not mistaken, this is not good for the sidewalls of a radial. You may have tread but.........
I'd be careful with this info.
I'd be careful with this info.
Not to mention seeing the high tire pressure message on your DIC everytime you start it up!
Race Director
Joined: Aug 2003
Posts: 16,270
Likes: 30
From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
Geez - the stock EMT's ride like wooden wheels on an ox-cart, when inflated to 30 psi.....
I cannot even imagine what they would be like at 40 psi
Sorry - I have to go with the GM recommendation - 30 psi.
In Arizona, I usually keep my BFG KDW's at 28 psi cold - which takes them to about 31 - 32 hot.
I cannot even imagine what they would be like at 40 psi
Sorry - I have to go with the GM recommendation - 30 psi.
In Arizona, I usually keep my BFG KDW's at 28 psi cold - which takes them to about 31 - 32 hot.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Burning Brakes
Joined: Jul 2004
Posts: 831
Likes: 0
From: Traverse City Michigan
My tech also tried to put 40 # in my tires (runflats) until I showed him the inside of the door. We put them back to 30#. Actually, I run them at 28 so that when they warm up they are at 31-32.
I don't believe the techs are familar with run flat tires.
I don't believe the techs are familar with run flat tires.
Pro
Joined: Apr 2004
Posts: 646
Likes: 18
From: Cocoa, FL
Originally Posted by Great White Shark
He claims 40psi will give me longer tread wear
Last edited by Fritz Hier; Sep 27, 2004 at 09:52 PM.
Race Director
Joined: Nov 2003
Posts: 12,346
Likes: 5
From: Mustang OK
Originally Posted by BigJoe
Hmmm the user manual says 30 the door sticker says 30. Both written by GM. Guess it boils down to who do you trust, all of GMs engineers or one alignment tech...
And, the GM service manual says 30 psi. When the tire pressure goes above 42 psi the Tire Pressure Monitoring System will display the High Tire Pressure warning message. Starting with 40 psi in you tires, it won't take many miles of driving before your tire pressure goes above 42 psi.
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Took the C5 in for an alignment today and the tech told me I was crazy to put in 30psi cold. He has been around many years and his alignments are the best I have ever found. He claims 40psi will give me longer tread wear
30 psi is the right number.. the only difference I have is my 30 psi is based on Hot tire pressure.. based on road conditions , just like any winston cup or nascar, formula 1 car tire pressure is set up.. they monitor the road temperature and adjust it accordingly to get the most milage out of the tires.. Personally , using this approach I got 43,000 miles out of my first set of EMT's...
I never allow my tires to get over 30 psi hot !!
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Originally Posted by lottavettes
Nine out of nine Chevy Dealers Ive dealt with say 35 lbs is best. Another 5k miles at least over 30....
Administrator
Joined: Mar 2001
Posts: 367,656
Likes: 24,661
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Sorry, but no way I would put 40 lbs pressure in the tires. Good way for the center of the tread to wear out very quickly. 30 psi cold is what is recommended by GM and the tire manufacturers.