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 Post subject: Tire Pressure
PostPosted: Mon Dec 21, 2015 10:31 am 
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Joined: Thu Dec 17, 2015 12:22 pm
Posts: 26
Location: Davis, California
On my first test drive the ride seemed pretty harsh, especially compared to the LEAF. Then I noticed all the tires were over 40 psi! Dropped them back to the recommended 35 and voila! Comfy ride! Still more taut and better controlled than the LEAF, but absorbing the bumps well.

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2015 Spark EV 2LT, Summit White
2016 Spark EV 2LT, Salsa Red
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 Post subject: Re: Tire Pressure
PostPosted: Mon Dec 21, 2015 12:05 pm 
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Joined: Wed May 29, 2013 12:00 am
Posts: 536
Location: Portland, OR
I run mine at 45+ psi for maximum efficiency. From 35 to 50 psi, there's a significant change in rolling resistance (seen in vehicle efficiency and range), with the obvious downside of a more harsh ride. This has been covered well here and just about any other forum for efficient cars. Pick your poison! ;)

Bryce


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 Post subject: Re: Tire Pressure
PostPosted: Tue Dec 22, 2015 5:24 am 
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Joined: Fri Mar 07, 2014 7:12 am
Posts: 93
It's like a Sleep Number bed. I'm at 38.

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2015 Silver Spark EV 1LT w/ Fast charge
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 Post subject: Re: Tire Pressure
PostPosted: Wed Dec 23, 2015 2:05 pm 
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Joined: Sun Apr 26, 2015 3:27 pm
Posts: 566
Location: Portland, Oregon
Like Goldielocks....45 was too harsh, 35 was too soft, 39 feels just right :D

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Last edited by nikwax on Mon Dec 28, 2015 9:49 am, edited 1 time in total.

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 Post subject: Re: Tire Pressure
PostPosted: Mon Dec 28, 2015 8:42 am 
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Joined: Sat Jan 10, 2015 12:16 pm
Posts: 94
Location: 2015 Spark EV, NorCal
Nashco wrote:
I run mine at 45+ psi for maximum efficiency. From 35 to 50 psi, there's a significant change in rolling resistance (seen in vehicle efficiency and range), with the obvious downside of a more harsh ride. This has been covered well here and just about any other forum for efficient cars. Pick your poison! ;)

Dumb question: Is this safe? I replaced the stock tires with the Yokohama S.drive tires, which list a max pressure of 51 PSI on the sidewall. Seems to me like tires inflated to 45 PSI when cold might hit 50 PSI when warm, which leaves very little margin. I'd love to get some of the range that I lost back, though...


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 Post subject: Re: Tire Pressure
PostPosted: Mon Dec 28, 2015 9:05 am 
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Joined: Wed May 29, 2013 12:00 am
Posts: 536
Location: Portland, OR
The max pressure listed on the sidewall of the tire is the max cold pressure (at the load/weight listed next to it). You're totally fine running a tire at 45 psi if the sidewall lists 51 psi max. You will affect the ride and handling, but efficiency is almost always improved (effectiveness depends on the specific tire and load).

Bryce


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