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

[mrgizmo04]

Center only.

Jesse

So you thought they were overinflated based on wear pattern you saw and already wore the centers some. Then you dropped the pressure. How long have you been driving with lower pressure? It will take a few k or more (also depends how long you've been driving overinflated and how much wear in center that had caused) to start evening out the wear.

[M3KVU]

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!

I run mine at 35psi cold

[Titaniu//M]

Semi related to this topic, but for those of you running these tire sizes, is your TPMS light on? Ever since I deviated from OEM sizing I have not been able to get my TPMS light to shut off. I have attempted to reset it multiple times. Just checked my tire pressure and they are the same from side to side - 35 psi front, 40 psi rear.

[IceInMyVeins14]

Semi related to this topic, but for those of you running these tire sizes, is your TPMS light on? Ever since I deviated from OEM sizing I have not been able to get my TPMS light to shut off. I have attempted to reset it multiple times. Just checked my tire pressure and they are the same from side to side - 35 psi front, 40 psi rear.

You have to reset the TPMS. I Pretty much just followed this video I found on YouTube! Hope this helps 👌🏼

[crbws6]

So you thought they were overinflated based on wear pattern you saw and already wore the centers some. Then you dropped the pressure. How long have you been driving with lower pressure? It will take a few k or more (also depends how long you've been driving overinflated and how much wear in center that had caused) to start evening out the wear.

It's counter-intuitive, but my experience was that using INCREASED rear pressure (>36) solved a center tread wear problem. I found the tip on a 911 forum.

[humarahumara]

It's counter-intuitive, but my experience was that using INCREASED rear pressure (>36) solved a center tread wear problem. I found the tip on a 911 forum.

I've notice that my centers (Pilot sport 4S) had 2/32nd more wear than the outside. I've kept the rears at 38 psi. Was going to drop psi down to 32-33 but now .... i'm not understanding how increasing tire pressure solved center wear problem?? Someone school me.
My set-up is ZCP with stock tire size. 225/40 19 and 255/35/19
35psi up front 38 psi out back.

[humarahumara]

Forgot to mention the center wear is only on the rear tires. No issues up front

[Slideways]

Forgot to mention the center wear is only on the rear tires. No issues up front

Too much PSI can cause center tread wear. If you have a IR thermometer, you can get a temp reading across the tread and that will give a rough idea of the temp difference between the center and outer edges of the tread.

[AbbeyRoad]

It's in the manual. I run 33/35. You run the higher 41/48 with full load, five passengers plus luggage in trunk.

[D-O]

I've notice that my centers (Pilot sport 4S) had 2/32nd more wear than the outside. I've kept the rears at 38 psi. Was going to drop psi down to 32-33 but now .... i'm not understanding how increasing tire pressure solved center wear problem?? Someone school me.
My set-up is ZCP with stock tire size. 225/40 19 and 255/35/19
35psi up front 38 psi out back.

I can't "school" you, but I can tell you what I found when I went down the rabbit hole....

Its been a while, so I am paraphrasing here.

I found an old thread on a Porsche forum (someone here did mention a Porsche forum - and that informed my search) where it was stated that way back when a BFG engineer had written that the sidewalls on modern low profile tires are so stiff that the majority of the tire's deformation while in operation is in the tread. Lower pressure will provide less stabilization of the tread and allow centrifugal force to expand the center area of the tread and lead to accelerated wear. Higher pressure will stabilize the tread and mitigate effect of centrifugal force thereby evening out the wear.

I have never been able to confirm this, so who knows. It would be great if we could get a tire engineer on here for some Q&A.

D-O