Scubaholic

I own a C6 Convertible Non-Z51. I just replaced the front stock Goodyear Run-flats with the Firestone Firehawk RFT's and I usually keep 30 lbs (cold) for tire pressure. The installer of the Firestones have me at 38 lbs. Should they be 30 lbs like the Goodyears or do they need more pressure?

95blklsc

38 sounds high, I would stay in the area of 30-34 for optimum wear and performance. If you keep them that high you might see a lot of centerline wear along with a really harsh ride.

AD2VET

I'm on my second set of the FS, for the fronts first set still on the back, and have been consistently running 30 psi cold front and rear with very good results. Misalignment caused the fronts to wear out early. I have found that higher pressures, especially in the rears, cause the middle of the tread to wear out prematurely.

bobk95945

I have the same tires with about 18000 miles on the I keep them at 30 lbs...so far the wear has been a lot better than I expected ...and much better than the goodyears,which came with the car

Scubaholic

Thanks for the replies. My guess would have been to keep them at 30. The local tire dealer here doesn't have a clue, even though he pretends to.

Jeff in Sarasota

I just had new Firestones installed today. They have them at 37 lbs all around. Unless someone says otherwise I will drop them to 30 tomorrow. I got just under 13,000 from the original GY Supercars.

The fronts were getting quite worn and I didn't want to fail tech inspection for my hot laps at Road Atlanta next week on the way to Bowling Green.
Jeff

cajun man 08

Had firestones put on today,pressure at 30lbs.

vettnut69

Had four Firestones installled couple of weeks ago and they told me to keep them around 34-35lbs (Hot)

Gearhead Jim

That would work out to about 30 lbs cold, exactly what the sticker says!

wolfdogs

if its O.E. tire size, it's O.E. pressure. Plain an simple. 30 psi. that dealer has his head up his (_!_)

Rogers 07

30psi cold is what I run in my Firestones.

cclive

1. Why would any tire dealer tell someone a hot pressure??? Tires are always quoted a cold pressure.
2. The dealer who says 37 must have been thinking that was what was needed to seat the bead...37 is ridiculous cold.

TBonez

Use 32 psi all around.... sometimes when they put them on they over inflate them. Also if the tires are hot the psi will increase. If the car is hot either let it cool and check your pressures probably will be around 35 or so.. then just let some air out until they are at 32/31 or so.

davekp78

Actually, I think HOT pressure is really the important pressure- after all, that's where the tire is driven.
For 30 psi cold, the hot pressure will vary a lot with road temp. Here in Florida, the pavement will get up to 130 in the summer. Not so up north.
I aim for 32-34 hot. 28 cold works best for me.
But I am most interested in good wear, and don't do burnouts to "impress" the populace.

wolfdogs

actually, cold pressure is the most important. The tire manufactures design the tire to function over a spectrum of heat increase, which, comes from the flexing of the tire components, not the temp of the roadway or ambient.

If a tire is properly inflated to the O.E. requirement for a specific load, it will only gain approx. 4 psi when its hot.

You always check the tire pressure cold. The one thing about TPMS that is good, is the fact that if you have your tires properly inflated to 30psi cold.. and you notice after driving for a period of time that one tire is, say, at 38 psi and the rest are at 34 psi... then thats telling you that the tire is having some internal problems, like belt shift, sidewall breakdown, etc.... because its over-flexing.. generating more heat, which can lead to sudden air loss (blow out).

sxeC7

The TPS will give an over pressure indication on your DIC, if you run any distance to heat the tires with that high a psi cold. It'll be happy with 30.

Vinnie T

Some installers just keep putting the air in until the tire seats and don't always recheck it. Considering the stiffer sidewalls on these tires, it usually takes more than 30 lbs. to get them seated so they should be adjusting pressure once that's done. Can't think of many reasons to keep 37 lbs+ in these tires unless you want them to wear in the middle or you need a good kidney punching

Put them at 30 lbs. cold and you should be good to go.

jpee

I run all my tires at 34 cold.. sometimes they will go to 38 on a long trip but I never got a DIC warning...and I seem to get the most wear from them... this is ALL brands..

AmmoVet

Thanks Wolfdogs,
"You always check the tire pressure cold. The one thing about TPMS that is good, is the fact that if you have your tires properly inflated to 30psi cold.. and you notice after driving for a period of time that one tire is, say, at 38 psi and the rest are at 34 psi... then that's telling you that the tire is having some internal problems, like belt shift, sidewall breakdown, etc.... because its over-flexing.. generating more heat, which can lead to sudden air loss (blow out)."

This was informative and makes sense. I've always run mine at 30 and watch them heat up to around 33/34 on a road trip. Now I'll check them periodically during the trip.

Mike

cclive

It always amazes me how much bad info is out there about tires. Wolf is right...real simple....