[jongri]

Upgraded to 2022 20" OEM Pacifica Wheels & had OEM Pirelli PZERO All-Season Self-Sealing Tires Mounted & Balanced on new Rims. Pacifica Owners Manual & Pirelli Tires only refer you to your Pacificas original Door Sticker for recommended Tire PSI which does me no good since mine came w/ 18" Standard Wheels and OEM Pirelli PZERO Tires size 245/60R18 w/ Factory set PSI between 40-41.
Currently my 245/50R20 OEM Pirelli Tires set between 36-37 psi. Help please & Thank you?

 

[cbrenthus]

Curious to see what someone with the 20" from the factory says, but I'm pretty sure the PSI is the same.

 

[CANADAHYBRIDGUY]

If your doing highway put a couple psi more in them but city driving you’d use same psi that factory setting with 20 inch tire/rim combination

 

[gmfreak]

Check the door sticker on the side of the drivers side door. Mine has recommended PSI posted on a sticker. You can also look at the sidewalls and it should state maximum PSI. Usually about 5-8 below that or at least 32 PSI will keep everything happy (TPMS monitors). My PSI states 36 on the door for 20 inch rims. I run 33-36 and it's fine. I do believe the previous poster is right that the PSI rating is the same for 18 or 20 inchers. I wouldn't worry too much if it's within the max range of the tires and the minimum range for the TPMS sensors.

 

[jongri]

Check the door sticker on the side of the drivers side door. Mine has recommended PSI posted on a sticker. You can also look at the sidewalls and it should state maximum PSI. Usually about 5-8 below that or at least 32 PSI will keep everything happy (TPMS monitors). My PSI states 36 on the door for 20 inch rims. I run 33-36 and it's fine. I do believe the previous poster is right that the PSI rating is the same for 18 or 20 inchers. I wouldn't worry too much if it's within the max range of the tires and the minimum range for the TPMS sensors.

Yeah my Door Sticker gives Tire pressure for my original standard 18" Wheels with 245/60R18 so that's no help since I upgraded my Pacifica's standard 18" Rims to OEM 20" w/ tires size 245/50R20. Thanks for the 33-36 psi for the 20" Rims on yours, much appreciated. I should be okay then where I set mine at 36-37 psi. Thank you again for your assistance with this you guys are awesome!

 

[gmfreak]

Yeah my Door Sticker gives Tire pressure for my original standard 18" Wheels with 245/60R18 so that's no help since I upgraded my Pacifica's standard 18" Rims to OEM 20" w/ tires size 245/50R20. Thanks for the 33-36 psi for the 20" Rims on yours, much appreciated. I should be okay then where I set mine at 36-37 psi. Thank you again for your assistance with this you guys are awesome!

If I'm not mistaken I believe the sticker is the same PSI for both 18 and 20 inch wheels. Just as long as it's not triggering the TPMS low pressure warning or above the max PSI rating on the sidewall of the tire you'll be fine. I just inflate mine to between those values. It seems my TMPS comes on at 31 PSI. I'm the type that is always adjusting the tire pressure because for my OCD to remain happy I need all the numbers to match lol.

 

[jongri]

If I'm not mistaken I believe the sticker is the same PSI for both 18 and 20 inch wheels. Just as long as it's not triggering the TPMS low pressure warning or above the max PSI rating on the sidewall of the tire you'll be fine. I just inflate mine to between those values. It seems my TMPS comes on at 31 PSI. I'm the type that is always adjusting the tire pressure because for my OCD to remain happy I need all the numbers to match lol.

Lol on the OCD. I'm a former GM/Chevrolet/Hummer 4x4 guy myself. Loved them all & miss them too! Good to know the Pacifica Door Sticker PSI is same for both 18" & 20" Rims my new 245/50R20s set btw 36-37 psi & TPMS hasn't alarmed yet. Thanks for your help my fellow GMC-Pacifica owner & everyone else replying here, greatly appreciated.

 

[cbrenthus]

I'm not sure, but I think it has more to do with weight than it does the tire size. Most passenger vehicles are mid thirties, and HD trucks are much higher. My Bronco is 39, and I think that is because it is a heavier vehicle, can't remember what my silverado was. I like to run pressure on the high side for performance, wear, and gas mileage. You can never go wrong running just a few PSI under the max on the tire, except it might be a bit slipperier in adverse conditions.

 

[VelvetRedAWD]

36 PSI is the magic number.
Adjust for seasonal weather changes!!!

36 takes into account rolling resistance, ride quality, handling, longevity, etc.

 

[Cool Minivan..... Nobody]

Upgraded to 2022 20" OEM Pacifica Wheels & had OEM Pirelli PZERO All-Season Self-Sealing Tires Mounted & Balanced on new Rims. Pacifica Owners Manual & Pirelli Tires only refer you to your Pacificas original Door Sticker for recommended Tire PSI which does me no good since mine came w/ 18" Standard Wheels and OEM Pirelli PZERO Tires size 245/60R18 w/ Factory set PSI between 40-41.
Currently my 245/50R20 OEM Pirelli Tires set between 36-37 psi. Help please & Thank you?

Here ya go.

 

[jongri]

Awesome thanks GM Freak. Believe it or not I'm getting better MPG with the 20" Wheels than I was getting with the Factory 18" Wheels by 2 MPG? Factory 18" Wheels (All Stop & Go driving) 40-41 psi I was getting only 15 mpg?
Now with 20" Wheels set between 36-37 psi (All Stop & Go driving) I'm getting 17 mpg, go figure! Must have something to do w/ the Factory 18" Wheels PSI setting of 40-41, which was too high, my guess?

 

[gmfreak]

One thing to remember that hasn't been mentioned is that I believe you need to get the speedometer recalibrated. Someone correct me if I'm wrong with these vans Not sure if the dealer can do it or not either. But the bigger tires will cause your speedometer to be off, at least in my experience. By how much I couldn't tell you. Even 1mph can make a difference to the police though lol.

 

[jongri]

36 PSI is the magic number.
Adjust for seasonal weather changes!!!

36 takes into account rolling resistance, ride quality, handling, longevity, etc.

Thank you VelvetRedAWD, much appreciated. I was only getting 15 mpg (All Stop & Go driving) w/ my Factory 18" Wheels PSI set between 40-41. Now with 20" Wheels (All Stop & Go driving) PSI set between 36-37 I'm getting 17 MPG?
36 PSI must be the Sweet spot as you stated for sure for both 18" Wheels w/ 245/60R18 tires or 20" Wheels w/ 245/50R20 tires on AWD Pacificas!

 

[jongri]

One thing to remember that hasn't been mentioned is that I believe you need to get the speedometer recalibrated. Someone correct me if I'm wrong with these vans Not sure if the dealer can do it or not either. But the bigger tires will cause your speedometer to be off, at least in my experience. By how much I couldn't tell you. Even 1mph can make a difference to the police though lol.

Never even thought of needing to get Speedometer calibrated for 20" Wheels verses original 18" Wheels. I'll call my CJD dealer & make an appointment ASAP. Many thanks to all commenting here for your invaluable wisdom & input, appreciate you all!

 

[gmfreak]

Never even thought of needing to get Speedometer calibrated for 20" Wheels verses original 18" Wheels. I'll call my CJD dealer & make an appointment ASAP. Many thanks to all commenting here for your invaluable wisdom & input, appreciate you all!

Let us know what the dealer says about the speedometer.

 

[stop-eject]

Pacificas come with 42PSI from the factory- to prevent flat spots when parked for extended periods of time on the lots. My dealer didn't bother to lower the pressure before the delivery, and I'm still running 42 PSI. I like a bit firmer ride, the wear seems to be better. PacHy is heavier too.

 

[jongri]

Let us know what the dealer says about the speedometer.

Chrysler service said they will have to calibrate the speedometer and also said they can get it real close depending on what they find when they hook it up & where it is now. I have appointment to drop it off 01/31/23 (soonest available). You were right gmfreak. Grateful to you for remembering that important, often overlooked tidbit. My future driving record thanks you, lol!

 

[Cool Minivan..... Nobody]

One thing to remember that hasn't been mentioned is that I believe you need to get the speedometer recalibrated. Someone correct me if I'm wrong with these vans Not sure if the dealer can do it or not either. But the bigger tires will cause your speedometer to be off, at least in my experience. By how much I couldn't tell you. Even 1mph can make a difference to the police though lol.

Chrysler service said they will have to calibrate the speedometer and also said they can get it real close depending on what they find when they hook it up & where it is now. I have appointment to drop it off 01/31/23 (soonest available). You were right gmfreak. Grateful to you for remembering that important, often overlooked tidbit. My future driving record thanks you, lol!

No calibration should be needed.
A 245/60R18 is 29.6" overall.
A 245/50R20 is the same 29.6" overall, meaning there will be no affect on the speedometer because the overall diameter is the same.

Gotta remember, adjusting wheel size doesn't mean overall diameter has to change.

 

[VelvetRedAWD]

Pacificas come with 42PSI from the factory- to prevent flat spots when parked for extended periods of time on the lots. My dealer didn't bother to lower the pressure before the delivery, and I'm still running 42 PSI. I like a bit firmer ride, the wear seems to be better. PacHy is heavier too.

Keep in mind that firmer tires transfer more road irregularities to the ball joints, bushings and struts.

 

[jongri]

Pacificas come with 42PSI from the factory- to prevent flat spots when parked for extended periods of time on the lots. My dealer didn't bother to lower the pressure before the delivery, and I'm still running 42 PSI. I like a bit firmer ride, the wear seems to be better. PacHy is heavier too.

Thanks for the explanation as to why my new Pacifica AWD 18" Wheels factory PSI were set to 40-41 PSI. Makes sense since most new Pacificas sit at Train Depot parking lots for several weeks after being dropped off (from Canada) before reaching their final dealership destinations. It makes sense that you kept your PacHy at factory setting 42 PSI since they're heavier than (GAS) AWD Pacifica's and MPG/electric so much higher too. For my Pacifica Touring L AWD the 36 PSI setting must be the sweet spot as far as MPG goes. Thanks for your explanation, appreciate you.