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#10522717 - 12/18/23 08:33 PM Tire PSI when down-sizing/plus-sizing? Winter vs summer?
furball Offline
Post Master Sr


Registered: 09/24/03
Posts: 9496
Loc: Toronto, ON
In short, wife's XC90 has summer 275/40R21, door jamb says 21" @ 38psi.

For winter running 235/55R19 @ 40 PSI winter tires ... same PSI or?

Is there a general formula/standard on what to set the PSI to? Or stick with the jamb? ???

For myself on the TLX, I run 17" summer and winters, but I typically go +2PSI for winter to account for air temp shrinkage :shrug: Makes for quite a shitty, clunky suspension ride... (Though for some reason, the mushy winters make for a better ride even tho PSI is higher.)

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#10522799 - 12/19/23 08:52 AM Re: Tire PSI when down-sizing/plus-sizing? Winter vs summer? [Re: furball]
Screamin Type ARGH! Offline
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Post Master Supreme


Registered: 02/20/01
Posts: 47784
Loc: T.O. - Canaduh
overthinking man, just run whatever's in the door jamb regardless of up/down sizing.

in winter i usually add in 1-2psi more all around as you'll lose some in the cold weather, and most ppl have short drive cycles in the GTA so not like you're warming up the tires tons in cold+city driving.
_________________________

"Ban low performance drivers, not high performance cars"

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#10522807 - 12/19/23 09:08 AM Re: Tire PSI when down-sizing/plus-sizing? Winter vs summer? [Re: Screamin Type ARGH!]
LNXGUY Moderator Offline
Post Master Supreme


Registered: 08/06/00
Posts: 107308
Loc: Barrie, Ont,
I run my winters at like 31-32 lol.
_________________________
-Bill
The GN would OWN you, your children and your children's children.
'09 E90 335d

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#10522818 - 12/19/23 09:26 AM Re: Tire PSI when down-sizing/plus-sizing? Winter vs summer? [Re: furball]
4Three Offline
Post Master Sr


Registered: 12/21/00
Posts: 5367
Loc: Markham, ON, Canada
In my opinion, a couple PSI either way isn't going to make a lot of difference. You'd also have to assume that your pressure gauge is calibrated to that level of accuracy before you could even argue that those couple PSI have a notable (most likely subjective) affect. But that's me, and I'm using peasant equipment.
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Fake right, cross-over, shoot lefty

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#10522821 - 12/19/23 09:37 AM Re: Tire PSI when down-sizing/plus-sizing? Winter vs summer? [Re: 4Three]
furball Offline
Post Master Sr


Registered: 09/24/03
Posts: 9496
Loc: Toronto, ON
My peasant equipment shows in kPa, so it's even more 'accurate' ... sure makes for an eye-twitch when all 4 are different values

 Originally Posted By: 4Three
...I'm using peasant equipment.

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