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50 PSI? Which model and what tires did you get?
My base 15" steelies only require 33 PSI, and they were at 35. Not a big deal for me since it's only +2 PSI, I just kept them at the current pressures
I drove mine home from the dealer hearing *ting ting ting* instead of *tump tump tump*. It was only a few miles home and somehow I associated it with tire pressure. I got home and they were all 50+ psi. I let the dealer know (in a friendly way) to have their techs check tire pressure a little better. No harm, no foul. I caught it early.
I had the snows put on and the shop wrote "33" on the ticket. But my blasted TPMS light was on. Turns out they were carrying 30 lbs.
As far as the Nitro Theory goes.... "They" say that the nitrogen molecule is lager than the air molecule thus makes it harder for the tire to loose air pressure through the tire itself. however air is not a single compound....
Air is made up of a mixture of gases. The major component of air is nitrogen gas followed by oxygen
Name Chemical formula Percentage composition by volume
FWIW, the reason many people find the tires at >40 psi when they take delivery is that Kia pumps them up to minimize the chance of damage to the tires (flat-spotting) during overseas shipping, sitting in inventory, etc.
The pre-delivery checklist includes checking tire pressure, but it is routinely ignored.
My 2011 was delivered to me (in December 2010) with 60 PSI in all four tires. It rode like crap and I couldn't figure out why. (I test drove one car, but bought another that had just come in -- guess it didin't make it throught the pre-delivery inspection.)
Anyway, they overfill them for ease of roll-on, roll-off in the ship containers.
Do you know how to reset that light if you add air and it does not go off? I am in Cincy and its very cold right now...what psi do you try to keep your tire at (when you feel like putting air in them....LOL)?