Ok so my main question is about a spare tires PSI. I got a flat the other day so I've been on a spare and am getting a new tire installed tomorrow. The spare tire itself reads 60 PSI. Is that really what it should be at even though the other tires are only around 30? I guess it does make sense since the tire is quite a bit smaller so it would need a higher PSI so hold the weight of the car? If so, my spare is drastically below that and I need to go fill it asap haha.

Secondly, the driver side door states the PSI of the tires should be 30. The other 3 tires I have state 44 PSI. Which should I be filling it to?

Thank you all!

 

Yes spare should be at 60 psi. I keep my stock oem 17" wheels at 32 psi.

 

Don't mistake max PSI with recommended PSI. I bet your other tires say max 44 PSI. And your tires can gain up to 10psi when heated up with driving, so I would stay well away from the max. The driver's side door recommendation of 30 is pretty safe. If you run a little higher you could get better mileage/tire life. If you run too high you will notice the middle of the tire wearing more than the outside.

And yes, spare is supposed to be at 60.

 

+1

Max and recommended are not the same. 44PSI is kind of a lot...

 

Thanks guys yeah I have always kept my tires at 32 but have never had to use a spare in my 8 years of driving so I really never knew it had to be so high of a PSI.

 

I never make PSI over 30. Spare is safe at 20.

 

30 is recommended from the factory.. although i do 35..

and spare is DEATH at 20.. it should be 60.

 

Yeah it seems as though the recommended PSI is 30 COLD. So on a cold day it should fall around 30. That means on a hot day it should probably be around 32-35. My tires seem to easily fluctuate 4-5 PSI between the cool early mornings and the hot afternoons.

Also, my spare was very low, around 30 and it looked like it was being crushed by the weight of the car. 20 PSI on a spare is a very bad idea.

 

Just to clarify, are we talking about the space saver spare tire? Or the full size spare? Both are available.

If it's the full size spare, its the same wheel as the other 4, so the tire pressure should be the same. NEVER fill to te pressure on the tire. CHeck the door sticker and fill to the recommended amount.

WIth narrow space saver spares, the pressure tends to be higher to support the weight of the car, so if the door sticker says 60PSI for the spare..that's it

 

This.

If it's a full-sized it should be a few PSI higher than the rest of the tires (because it's likely to lose air while sitting for so long.

IDEALLY you're supposed to store tires about 10-15 PSI below operating range. ie. when you take your summer tires off yo'ure supposed to deflate them down from 33 to 20 PSI for storage. This helps longevity of the tire when it's not being used/loaded regularly.

Based on THAT you'd want your spare tire at 20 PSI for storage in your trunk, but because a spare is for emergencies/roadside issues, you want that thing up to pressure at all times, it's not great for the tire but is much better for you, and it's purpose.

 

Why is everyone trying to confuse him?

http://www.ebay.com/itm/2003-INFINIT...ht_6922wt_1037

This is probably your spare.

60 PSI. the end.

 

Just an FYI, if your TPS light is coming on check your spare. It needs love too.

 

So it's better to assume:

1. that ebay listing is 100% accurate and the seller knows that this is what was spec'd for a 2003 and is the only option

2. the year that the OP had, because he didn't say

3. The type of spare tire he has, because he didn't say

 

why is this post still going?

OP, you can also check your driver side door sticker thing. At the bottom it should have the spare tire pressure, which i bet you will say 60 psi.

Dudes, stop trying to kill OP with recommending 20psi on that donut.

 

i put 50 psi in the spare max is 60.