menkster
Posts: 6
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Delivery Date: 01 Jan 1917

55+ psi tire pressure... any reason for that?

Mon Jan 09, 2017 9:20 pm

I recently purchased a used 2013 Leaf (about 3 weeks ago). Previous owner had tires changed within the last few months, not sure where they got them changed.

I purchased an OBD unit (Konnwei KW902) and ran LeafSpy while on the road. LeafSpy displayed the pressure as 58 psi. I read in the manual and on these forums that tire pressure should generally be around 35-40 psi, so I thought wth... that can't be right. I then used a cruddy digital gauge and measured each tire to be around 47 psi. Then I used another cruddy portable air compressor with built-in gauge to measure tire pressure and got around 55 psi.

Regardless, it appears my tire pressure is well above 40 psi. My question is... is there any reason this might be? Maybe there's something I don't understand about tire pressure. The tires themselves say max pressure 35 psi, so I thought that was concerning. Can they even be inflated to 55 psi if it says max pressure is 35 psi??? Also, the car seems to drive fine, which is mainly why I didn't think there was any reason for concern. Then again, it's the only Leaf I've ever driven so I have no comparison point.

Should I deflate until the TPMS readings on LeafSpy read 40ish? Or should I just leave them be if they've operated this long without seeming to be troublesome?

Thanks!

skhmc
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Leaf Number: 416991
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Re: 55+ psi tire pressure... any reason for that?

Mon Jan 09, 2017 10:43 pm

I doubt the tires themselves say 35psi max. Most modern tires (in the size range we're talking about here) are either 44psi or 51psi max.

44psi is recommended by a lot of Leaf owners as it seems to be a good balance of handling and increased mileage (maybe 10%). I'm currently running about 42psi up from 35psi. My miles per kWH went from 3.7 to 3.9, about 5.5% better.

Where are you getting the idea the tires are 35psi max? The card on the door doesn't list the max pressure of the tire, just what Nissan recommends. (They likely bias it softer for better ride.)
2013 Red SV, 27,200 miles (purchased used)

LeftieBiker
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 12:03 am

The 36psi on the door label is too low, and the tires are too high. 38-44, depending on softness of ride desired, is the correct range for a Leaf. I do 40-42.
Last edited by LeftieBiker on Tue Jan 10, 2017 4:04 am, edited 1 time in total.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

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garsh
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 3:03 am

Note that tires heat up a lot while driving, which increases the pressure. So don't worry about the tire pressure being way high while on the road.

When you're filling them up & setting the pressure, the tires should be cold.
2012 Black SV w. G35 wheels, 8 bars, 86,000 miles

jjeff
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Leaf Number: 422121
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 7:02 am

menkster wrote:I recently purchased a used 2013 Leaf (about 3 weeks ago). Previous owner had tires changed within the last few months, not sure where they got them changed.
...The tires themselves say max pressure 35 psi, so I thought that was concerning. Can they even be inflated to 55 psi if it says max pressure is 35 psi???

I haven't seen 35 max PSI tires since the 80s.....everything new seems to max out at 44 psi or higher. If those replacement tires are indeed 35 max psi(your reading this off the tires and not door jam of car??) then personally I would NOT go above 35 psi, max is max. Sure it can be pushed and they probably wouldn't blow, but why take a chance. Again personally I like to run with the MAX tire pressure on cars or a tad less, but not really more, well unless very cold weather is very close and then I may go up to 10% more, but never almost double :shock: which it sounds like your tires may be inflated to.
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powersurge
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 9:49 am

You can run the tires up to about 40-42 psi on tires of that size. Over 50 psi is way too high..

DaveinOlyWA
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 12:34 pm

skhmc wrote:Where are you getting the idea the tires are 35psi max? The card on the door doesn't list the max pressure of the tire, just what Nissan recommends. (They likely bias it softer for better ride.)


nope. they do it to get better prices for the tires they need. Care to figure out how much a 15% reduction in tire life is worth?
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menkster
Posts: 6
Joined: Mon Jan 09, 2017 9:01 pm
Delivery Date: 01 Jan 1917

Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 8:33 pm

skhmc wrote:I doubt the tires themselves say 35psi max. Most modern tires (in the size range we're talking about here) are either 44psi or 51psi max.

44psi is recommended by a lot of Leaf owners as it seems to be a good balance of handling and increased mileage (maybe 10%). I'm currently running about 42psi up from 35psi. My miles per kWH went from 3.7 to 3.9, about 5.5% better.

Where are you getting the idea the tires are 35psi max? The card on the door doesn't list the max pressure of the tire, just what Nissan recommends. (They likely bias it softer for better ride.)


Hmmm... okay, well it helps me to know this is unusual enough that you doubt it.

This is why I think the tires are 35psi max... am I interpreting it incorrectly?

Image
Image

menkster
Posts: 6
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 8:38 pm

jjeff wrote:I haven't seen 35 max PSI tires since the 80s.....everything new seems to max out at 44 psi or higher. If those replacement tires are indeed 35 max psi(your reading this off the tires and not door jam of car??) then personally I would NOT go above 35 psi, max is max. Sure it can be pushed and they probably wouldn't blow, but why take a chance. Again personally I like to run with the MAX tire pressure on cars or a tad less, but not really more, well unless very cold weather is very close and then I may go up to 10% more, but never almost double :shock: which it sounds like your tires may be inflated to.


Okay... I thought maybe there's something I didn't know about tires but I guess it's as straightforward as it seems. I don't know what crazy-ass tire shop the previous owners took the car to, but I'll let the air out to 35 psi cold and maybe chance some over-pressure when they're warm, since... I mean... they're currently at like 57 psi.........

LeftieBiker
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Re: 55+ psi tire pressure... any reason for that?

Tue Jan 10, 2017 9:55 pm

So, Menkster, can you verify that 35psi maximum is actually stamped on the tires? Maybe they are Chinese bargain basement units, in which case I'd replace them.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

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