jbm79

I have a full-size spare tire complete with TPMS. The four tires, based on the TPMS, are at 230 kpa (~33 psi) and the spare is at 300 kpa (~44 psi)...yes, my vehicle is using the metric system on the tire pressure, but US/imperial on others .

I'm puzzled as to why the spare is kept at a much higher pressure when all 5 wheels and tires (Michellin Primacy) are identical.

Should I be including the 5th tire into the rotation schedule?
And should I reduce the "spare" tire's pressure to 33 psi?

txes

Change your readout to read psi.

My take on the higher reading for the spare is that it sits in the trunk waiting to be used
if needed. Thus it is storage pressure.

Today's tire rotations don't use the spare tire as in the past. Usually nobody has
a full spare tire.

Check the spare every few months to make sure it is ready if needed.

John

jbm79

How do I do this??? I looked through the settings and couldn't figure it out.
I even asked the dealer, and they said they couldn't change it

Arty101

To change to US<>Metrics, hit the display button on the steering wheel, and go through the display to settings or similar. I believe that's where you can change the tires to psi.

Also, I agree with John. Typically they keep a higher psi for the spare, and I wouldn't rotate it out.

txes

Since your location is GU, are you by chance in Guam?

If so you might not be able to change.

John

jbm79

Yes, I am in Guam. No biggie if I'm stuck with the psi. Weird thing is, I had an ES300h loaner a few weeks ago, and it had PSI. Didn't bother asking my salesperson, as it seems I know more about the vehicle's features than he does (He didn't even know that the battery was located in the trunk )

jbm79

I had looked through the settings, both on the steering wheel and in the Nav...with no luck. Oh well.

mcomer

By all means use the spare in the rotation every 5,000 miles. At 50k miles every tire will have 40k on it, right?
No sense having an aged overinflated tire that may not match the next generation of replacement tires you buy.

The miles/kilometer switch is in setup under "units"

Arty101

My 300h has a donut spare that you don't rotate.