20" Wheels and TPMS

PhinFL · Jul 17, 2015

Put new 20" wheels on the car today, with new TPMS sensors. After a few miles of driving, the car recognized that there were new wheels and asked if they were 19" or 21". Being that these tires are much bigger than the 19"s, I opted for the 21" option. It successfully communicated and accepted the new sensors. Now the car is telling me that I am low on pressure on 3 of the 4 tires. I have a staggered set-up. 245/40's up front, 275/35's out back. Can someone who has 20"'s on their car please enlighten me how to get the TPMS to stop freaking out? What pressures are you running or what pressures is the TPMS looking for?

Many thanks in advance.

vitaliy · Jul 17, 2015

Multi-Coat White with 20" wheels? Staggered? That is awesome. May I ask you for some photos?

PhinFL · Jul 17, 2015

vitaliy said:
Multi-Coat White with 20" wheels? Staggered? That is awesome. May I ask you for some photos?

Just got the wheels mounted today and then the skies opened up. I hope to get some photos posted in the next day or two once I can clean it up.

drsaab · Jul 17, 2015

I went from 19 to 20 staggered and chose 19 when it asked. Pressures are set at 46.

vitaliy · Jul 19, 2015

PhinFL said:
Just got the wheels mounted today and then the skies opened up. I hope to get some photos posted in the next day or two once I can clean it up.

Can't wait

GaryREM · Jul 20, 2015

245/45R19 27.7" standard 19

245/40R20 27.7"
275/35R20 27.6"

245/35R21 27.8" standard 21

Looks like you should choose 19" when you have the option.

linkster · Jul 20, 2015

The TPMS is all about the minimum pressure threshold for activation/warning and has nothing to do with wheel/tire size. I can't remember those values anymore. I always start at 2 psi below the maximum pressure as stated by the tire manufacture and monitor tire wear. I have never bothered, nor do I care in the least what the final assembler recommends (which is tainted between marketing (cushy ride), engineering and other departments) . I have run my inefficient (they run wide and short) el-cheapo 20 Bridgestones at both 19 and 21 toggle positions without any issues.

@drsaab
In the future please don't mix pictures at various

supercharger locations of your spectacular S with awesome 20's as I am easily confused. :biggrin::biggrin:

PhinFL · Jul 20, 2015

vitaliy said:
Can't wait

Unfortunately my MS fell prey to the dreaded leaking Pano roof virus. It went back to the S/C on Saturday to remedy that problem and in the process square away the "TPMS never being satisfied regardless of wheel diameter and tire pressure" issue. Hopefully getting it back tomorrow.

PhinFL · Jul 21, 2015

Got my MS back from the S/C today and as promised, photos of the new shoes. Folks over at the S/C were loving them. They are Forgestar F14 in glossy gunmetal. 20x9 up front, 20x10.5 in the rear. As it happens, it is not enough that the MS can now recognize new TPMS sensors through the touchscreen, it needs to recognize them in the correct location on the car, otherwise it will choke (ie. Front Right, Front Left, etc.). A quick wave of the magic wand at S/C got the car to recalibrate.

vitaliy · Jul 22, 2015

Thanks! As expected, this is the best looking Model S I have ever seen! And 20" wheels are far more practical than 21". Well done!
Are you considering getting red brake calipers? Would you mind if copy of your car drives in Northern Virginia?

artsci · Jul 22, 2015

linkster said:
The TPMS is all about the minimum pressure threshold for activation/warning and has nothing to do with wheel/tire size.

True. TPMS is reading pressures and the wheel size setting accounts for nothing. So not to worry.

cryptyk · Jul 22, 2015

artsci said:
True. TPMS is reading pressures and the wheel size setting accounts for nothing. So not to worry.

What exactly does the wheel size selection do? Is it for odometer? Range calculations?

GetYourWheels · Jul 23, 2015

PhinFL said:
Got my MS back from the S/C today and as promised, photos of the new shoes. Folks over at the S/C were loving them. They are Forgestar F14 in glossy gunmetal. 20x9 up front, 20x10.5 in the rear. As it happens, it is not enough that the MS can now recognize new TPMS sensors through the touchscreen, it needs to recognize them in the correct location on the car, otherwise it will choke (ie. Front Right, Front Left, etc.). A quick wave of the magic wand at S/C got the car to recalibrate.

View attachment 88153 View attachment 88154 View attachment 88156 View attachment 88158

The Forgestar F14s are looking incredible Eric, thanks for sharing the pics!

Glad you got the TPMS issue sorted

Enjoy the wheels and let me know if you need anything else

linkster · Jul 25, 2015

cryptyk said:
What exactly does the wheel size selection do? Is it for odometer? Range calculations?

The touchscreen toggle (19 or 21) sets the minimum acceptable tire pressure threshold warning since the 19's and 20's run different pressures.

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20" Wheels and TPMS

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