Tire Pressure for 245/35/19 & 275/30/19

[IceInMyVeins14]

What’s up guys! Just got these tire sizes mounted and checked the tire pressure afterwards and seemed pretty off.

30.5 front left
37.5 front right
33.3 rear right
35.5 rear left

anyone know what I should be at if I’m just daily driving, and since we’re quarantined, what it should be at if my car is in the garage?

thanks!

[FBloggs]

I run those sizes at 32 psi cold.
I'm surprised that the tpms isn't lit on your i/panel.
edit ; sorry I run 18's

[Obioban]

What’s up guys! Just got these tire sizes mounted and checked the tire pressure afterwards and seemed pretty off.

30.5 front left
37.5 front right
33.3 rear right
35.5 rear left

anyone know what I should be at if I’m just daily driving, and since we’re quarantined, what it should be at if my car is in the garage?

thanks!

Depends how much your cars weight and how much heat you put into them when you drive. I'd want to be 33-34 for a lighter e46 coupe, up to 36-37 for a heavier SMG vert with subs in the trunk.

Edit: I, too, meant 18s... no idea on 19s.

[jbfrancis3]

19's need to run at a higher pressure compared to 18's. If your vehicle came with 19" option, the door jamb label will have pressures for the factory-optioned 19's. It'll be 41 psi front and 48 psi rear. I knock off a few psi from those but they are the starting point for me.

I have the same tire sizes as you in the Pilot Sport 4S's. I haven't played much with pressures nor know much about the underlying assumptions so I'd welcome additional comments.

[Obioban]

19's need to run at a higher pressure compared to 18's. If your vehicle came with 19" option, the door jamb label will have pressures for the factory-optioned 19's. It'll be 41 psi front and 48 psi rear. I knock off a few psi from those but they are the starting point for me.

I have the same tire sizes as you in the Pilot Sport 4S's. I haven't played much with pressures nor know much about the underlying assumptions so I'd welcome additional comments.

What tire pressures you have on your door jam also depends on your model year. In 01-04 BMW gave "standard" tire pressures and "max capacity" (fully loaded car) tire pressures (higher). In 05+ they only gave max capacity tire pressures in the USA.

... yet another way lawyers have forced everyone to be treated like idiots in this country.

[jbfrancis3]

What tire pressures you have on your door jam also depends on your model year. In 01-04 BMW gave "standard" tire pressures and "max capacity" (fully loaded car) tire pressures (higher). In 05+ they only gave max capacity tire pressures in the USA.

... yet another way lawyers have forced everyone to be treated like idiots in this country.

I didn't realize they were quoting max capacity (on my '05), good to know.

Just to clarify: my comment around 19's needing higher pressure was limited to this vehicle; with a lower profile you need a higher pressure, all else equal. The wheel diameter itself has no influence on pressure need.

[SG/IRM3]

It also depends on the type of tire and it's construction. A tire with a stiffer sidewall,i.e. the RE-71R can be run at a much lower pressure than a tire with a softer sidewall so it's hard to provide tire pressure guidance for every tire. Experiment to find the wear and handling characteristics you prefer.

[kermmmit7]

What’s up guys! Just got these tire sizes mounted and checked the tire pressure afterwards and seemed pretty off.

30.5 front left
37.5 front right
33.3 rear right
35.5 rear left

anyone know what I should be at if I’m just daily driving, and since we’re quarantined, what it should be at if my car is in the garage?

thanks!

My ZCP 19s shows 33 psi front 38psi rear , I run 245/275 Michelin pilot 4s and they are more comfortable than my stock 18s with winter Michelins. Check pressure on the morning . Tires should be cold.

[BearDeXPS]

ZCP 19's I run 34f / 36r cold

[D-O]

Continental Extreme Contact Sports 245/275 19's

32 front
32 rear

The rears did not wear evenly (center wore noticeably faster that the edges) so I have dropped the rears to 30. We shall see.

Jesse

[crbws6]

Originally skeptical about the door jam pressures (higher in rear). After experiencing accelerated rear wear by running 35F, 32R, I decided to try the door jamb bias and, sure enough, rear tire wear was greatly improved. Current street pressures:

For stiffer sidewalls (e.g. RE-11 or 71R):
245/3519: 33
275/30/19: 38

For softer sidewalls (PS4, Indy 500)
Add 2-3 psi to the above.

[Tbonem3]

On staggared setups, the rear PSI should be higher because the profile is lower to match the front rolling circumference due to wider rear wheel. So that bias does make sense.

Jesse, seems like you should go the other way, higher in the rear given that the tire is 30 series as opposed to front 35 series.

Personally, on MPSS, I run low PSI (30), but I don't care about tire wear. MPSS also turn into bricks once above low 30s.

OP: Try something like 35 F 40 R

[IceInMyVeins14]

Thanks for all the responses guys!

I am running MPS4S and live in OC and adjusted my tire pressures to 33F and 38R, but maybe I’ll go that suggested route from crbws6 and Tbonem3 with 35F & 40R! Hope you guys are staying safe during quarantine 🤙🏽

[mrgizmo04]

19's need to run at a higher pressure compared to 18's. If your vehicle came with 19" option, the door jamb label will have pressures for the factory-optioned 19's. It'll be 41 psi front and 48 psi rear. I knock off a few psi from those but they are the starting point for me.

Max inflation pressure of a tire is around 50psi, which is also stamped on the sidewall of the tire. Hopefully you are not running 48 rear, that is very skiddy and oversteery, and dangerous because after some driving can get those pressures much higher, not even talking about tire wear or comfort and feeling every pothole.

[jbfrancis3]

Max inflation pressure of a tire is around 50psi, which is also stamped on the sidewall of the tire. Hopefully you are not running 48 rear, that is very skiddy and oversteery, and dangerous because after some driving can get those pressures much higher, not even talking about tire wear or comfort and feeling every pothole.

Yes max inflation of this tire is 50 psi and I think I've been running them at 45 psi. Which is too high and I'm grateful to the OP for asking the question. Knocking them down should take out some harshness. Incorrect, yes, but 45psi is not skiddy and oversteery.

The max inflation pressure is cold so the comment around higher pressures after driving is an improper comparison.