Bronco Nation

Tire size question - TPMS after going from 33 to 35

Fillups
Dec 19, 2025

Rank IV

Dec 19, 2025

I feel like this may be a silly question, but here goes…

I finally bit the bullet and swapped out my stock Badlands 33’s with takeoff SAS rims and Mickey Thompson tires. Since the rims came with Ford TPMS, I assumed they would pair up
automatically. They did sync automatically, but they are not sending accurate tire pressure. With my tires at 35 psi they send around 28 to my dash. I assumed the sensors sent the true tire pressure, but now I am coming to the conclusion that I need the tire size changed in order for the pressure to be correct.

I knew the speed would be off slightly, but I didn’t expect reprogram just to get the tire pressure correct. Can someone let me know? Thanks!
22 Badlands 2-door, 7MT, HP Red, delivered Nov 2022
Former fords: '83 Mustang Conv, '94 Bronco XLT, '05 Excursion PSD, '10 Expedition EL EB (still the family wagon).

Rank IV

Dec 19, 2025

#1
follow up - dealer Wants $195 as a standard programming fee. Same dealer that has reasonably priced oil changes for $59 ironically. Ouch.
22 Badlands 2-door, 7MT, HP Red, delivered Nov 2022
Former fords: '83 Mustang Conv, '94 Bronco XLT, '05 Excursion PSD, '10 Expedition EL EB (still the family wagon).

Wherever you go, there you are!

Dec 19, 2025

#2
Weird.. I went from stock Badlands 33" to 35x11.5R17 and mine is dead on accurate. Maybe try this $12 programming tool from Amazon. The reviews say it works on the Bronco.. Not sure if it would solve your problem but it can't hurt to try for $12 right?

TPMS Reprogram Tool - Amazon
onX Trail Guide & Tread Lightly Member
2023 Badlands 2 door in Hot Pepper Red 🌶️ 🌶️
Fillups

Rank IV

Dec 19, 2025

#3
Fillups
I feel like this may be a silly question, but here goes…

I finally bit the bullet and swapped out my stock Badlands 33’s with takeoff SAS rims and Mickey Thompson tires. Since the rims came with Ford TPMS, I assumed they would pair up
automatically. They did sync automatically, but they are not sending accurate tire pressure. With my tires at 35 psi they send around 28 to my dash. I assumed the sensors sent the true tire pressure, but now I am coming to the conclusion that I need the tire size changed in order for the pressure to be correct.

I knew the speed would be off slightly, but I didn’t expect reprogram just to get the tire pressure correct. Can someone let me know? Thanks!

Since they did sync up automatically, try dropping the pressure 10 pounds or so and then returning them to correct pressure. My second set of wheels/tires were off until I did this. Many newer sensors are automatic and don’t require any tools to calibrate. Certainly worth a try.
615_Bronco, Fillups

Rank IV

Dec 19, 2025

#4
raqball
Weird.. I went from stock Badlands 33" to 35x11.5R17 and mine is dead on accurate. Maybe try this $12 programming tool from Amazon. The reviews say it works on the Bronco.. Not sure if it would solve your problem but it can't hurt to try for $12 right?

TPMS Reprogram Tool - Amazon

Good tip. I may also stop by the tire shop that mounted them for me. they only mounted and balanced the tires, I put them on the bronco at home. But they still got my money for the tires and mounting, 😝. So they would probably be willing to reprogrammed for me.
22 Badlands 2-door, 7MT, HP Red, delivered Nov 2022
Former fords: '83 Mustang Conv, '94 Bronco XLT, '05 Excursion PSD, '10 Expedition EL EB (still the family wagon).

Rank IV

Dec 19, 2025

#5
extra toasty
Since they did sync up automatically, try dropping the pressure 10 pounds or so and then returning them to correct pressure. My second set of wheels/tires were off until I did this. Many newer sensors are automatic and don’t require any tools to calibrate. Certainly worth a try.

Thanks for the tip, I may try this first then. I have aired them down for a trail ride once and back up, but I only took them down to 25 pounds or so. Maybe that wasn’t enough of a drop to reset… not sure.
22 Badlands 2-door, 7MT, HP Red, delivered Nov 2022
Former fords: '83 Mustang Conv, '94 Bronco XLT, '05 Excursion PSD, '10 Expedition EL EB (still the family wagon).
extra toasty

Rank IV

Yesterday at 9:49 pm

#6
Follow up to this thread...
I tried the 2 different methods mentioned here several times (going thru the menu, hazard button, dropping pressure, etc.) with no luck. Finally stopped by the tire store last week to learn TPMS sensors are on a different (higher) frequency than the Bronco. They can tell that from the fancy scanner they have. The wheels I bought were off a 2025 Badlands and from what their scanner could tell, sometime in 2024 Ford switched to a different frequency sender - so my 2022 Bronco is recognizing the TPMS senders, but displaying inaccurate pressure. And if I'm on a road trip, they will then display an error code after a while.

They will swap out my TPMS for $25 per tire (I still have the OEM set). Probably worth doing, unless someone knows if the Bronco can be reflashed to the newer TPMS frequency? I feel like that option is fraught with other issues down the road though.
22 Badlands 2-door, 7MT, HP Red, delivered Nov 2022
Former fords: '83 Mustang Conv, '94 Bronco XLT, '05 Excursion PSD, '10 Expedition EL EB (still the family wagon).
extra toasty

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