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This is a discussion on Max it out? within the Gen II Prius Care, Maintenance and Troubleshooting forums, part of the Gen II (2004-2009) Toyota Prius Forums category; I have noticed that my front tires are different from the back . I am a member of the 44/42 ...


Max it out?

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Old 07-10-2008, 12:05 PM   #1
perryma
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Default Max it out?

I have noticed that my front tires are different from the back . I am a member of the 44/42 club but have realized my front tires have a max of 55. The rear is ...45? Something like that. Anyway, should I bump up the pressure on the front or will this mess things up?
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Old 07-10-2008, 12:17 PM   #2
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Default Re: Max it out?

stick with the 2psi pressure difference. try 50 fr 48r.
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Old 07-10-2008, 12:20 PM   #3
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Default Re: Max it out?

I like to use 2 front, 0 rear psi, which still maintains the required two psi delta. I find it gives a softer ride.

Tom
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Old 07-10-2008, 12:26 PM   #4
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Default Re: Max it out?

2 PSI differentail, but do NOT exceed the manufacturer's maximum PSI rating as indicated on the side of the tire.
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Old 07-10-2008, 12:52 PM   #5
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Default Re: Max it out?

Quote:
Originally Posted by qbee42 View Post
I like to use 2 front, 0 rear psi, which still maintains the required two psi delta. I find it gives a softer ride.

Tom
How does that work for your mileage?
I was thinking of running 0 front and 1 rear since the adding the fronts and adding the rears would be a 2psi difference.
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Old 07-10-2008, 01:34 PM   #6
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Default Re: Max it out?

i tried that max pressure thing on my touring for one day, was impressed with the less rolling resistance, took one look at the tires, laughed, worried about my new tire warranty and changed it back to what it says on the door jam

ill try it again when i can get cheap tires in the 195 55 16 size
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Old 07-10-2008, 03:38 PM   #7
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Default Re: Max it out?

Quote:
Originally Posted by TonyPSchaefer View Post
How does that work for your mileage?
I was thinking of running 0 front and 1 rear since the adding the fronts and adding the rears would be a 2psi difference.
I don't know yet. The tires keep falling off of the back rims. Do you think I need better tires?

Tom
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Old 07-10-2008, 04:03 PM   #8
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Default Re: Max it out?

Quote:
Originally Posted by rigormortis View Post
i tried that max pressure thing on my touring for one day, was impressed with the less rolling resistance, took one look at the tires, laughed, worried about my new tire warranty and changed it back to what it says on the door jam
I don't understand: what did you see that made you laugh?
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Old 07-10-2008, 04:30 PM   #9
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Default Re: Max it out?

Quote:
Originally Posted by qbee42 View Post
I like to use 2 front, 0 rear psi, which still maintains the required two psi delta. I find it gives a softer ride.
I took this a step further and tried 0 front, -2 rear, but the ride suffered, as atmospheric pressure crushed the rear tire carcasses.
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Old 07-10-2008, 05:23 PM   #10
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Default Re: Max it out?

Quote:
Originally Posted by qbee42 View Post
I don't know yet. The tires keep falling off of the back rims. Do you think I need better tires?

Tom

No, just use some super-glue...

I've been running my Touring at 50/48 for 4 weeks. It was a bit unstable in wind on my last long trip, and I'm concerned my traction is lower, so I'm going to try 40/38 for a while.

So far, I think I'm getting a 5-10% MPG hit. But if the car handles better and stops quicker and is less susceptible to wind, I don't care about the MPG hit; it's only $60-120 a year; One prevented accident every 5-10 years will more than pay for the gas IMO.
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2008 "Canadian base" (Touring pkg 2++): PSI: 50/48. Best 40 mile RT commute max 31-44 MPH: 60 US MPG. (37-50 MPH: 54 MPG)
Why: (1) thrift, (2) Priups/PHEV hackable, (3) ecology.
Week 5: 1250 miles, 3MClearbra, oil lower, 50/48 PSI, Trim ring remov, ScotchGard, UOA.
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