Pizza Cutters - what PSI for street? - Toyota FJ Cruiser Forum
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post #1 of 6 (permalink) Old 10-01-2008, 07:51 PM Thread Starter
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Pizza Cutters - what PSI for street?

To all the folks running pizza cutters, how much pressure are you running on the street?

I had my Maxxis Bighorns down at 35 then did the horizontal chalk test and found that I was running them a bit low. Upon a few more tests I found that 43lbs would give me optimal wear results, while being still somewhat comfortable.

Is it the height of the sidewall that requires me to run higher pressures?

Anyone else care to share?

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post #2 of 6 (permalink) Old 10-01-2008, 08:11 PM
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Re: Pizza Cutters - what PSI for street?

I'm running my SS SSR 35 X 10.5 X 16's at 45 psi. I prefer to have them slightly over-inflated than under since it does help with mileage. And, I would prefer to be running on the center lugs of this tire than the outers...

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post #3 of 6 (permalink) Old 10-01-2008, 08:15 PM
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Re: Pizza Cutters - what PSI for street?

Quote:
bkw previously said: View Post
To all the folks running pizza cutters, how much pressure are you running on the street?

I had my Maxxis Bighorns down at 35 then did the horizontal chalk test and found that I was running them a bit low. Upon a few more tests I found that 43lbs would give me optimal wear results, while being still somewhat comfortable.

Is it the height of the sidewall that requires me to run higher pressures?

Anyone else care to share?
I'm running 35's in a 60 series 13" 40psi and will get some Pizza cutters on some different rims to keep my height. In the past I have aired up to 45psi and if the ride is to rough than I come down 2lbs at a time. I found that I usally work my way up depending how heavy I ride loaded down. I wanted to get a better mileage and between 45 and 47psi the tires are firm and the tread wear is even. I believe the side wall height is the culprit.

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post #4 of 6 (permalink) Old 10-02-2008, 08:38 AM Thread Starter
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Re: Pizza Cutters - what PSI for street?

Thanks! I had thought it was a little odd that these tires need more air than their 265 and 285 brethren.

Brian

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post #5 of 6 (permalink) Old 10-02-2008, 09:01 AM
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Re: Pizza Cutters - what PSI for street?

Don't run my 34x10.5 LTBs everyday, but when on pavement on the way to the trails I put 45lbs in them. I tried them at 50lbs and 55lbs, but they just made the rig shimmy more. I get a weird balance issue when I run them that high, that seems to disappear when I run them at 45lbs. And believe me, it took lots of lead to balance this wheel/tire combo.

Depending on your tread pattern (and I think the SSR's and LTB's are similar enough) the goal is to put enough PSI in to get the sidewall lugs off the pavement. What mtbcoach and I do is put enough in to lift the side lugs off and run primarily on the center tread pattern which is a smoother, quieter ride. Also, with certain rubber compounds, you can tear off those side lugs under high speed turns.

I think you'll just have to do a your own empirical testing (trial and error) to find out what works best. Also if you are going to run them daily, then you will need to find a compromise between 1) even wear, 2) smoother ride and 3) balance.

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post #6 of 6 (permalink) Old 10-02-2008, 09:20 AM
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Re: Pizza Cutters - what PSI for street?

Quote:
BMThiker previously said: View Post
Don't run my 34x10.5 LTBs everyday, but when on pavement on the way to the trails I put 45lbs in them. I tried them at 50lbs and 55lbs, but they just made the rig shimmy more. I get a weird balance issue when I run them that high, that seems to disappear when I run them at 45lbs. And believe me, it took lots of lead to balance this wheel/tire combo.

Depending on your tread pattern (and I think the SSR's and LTB's are similar enough) the goal is to put enough PSI in to get the sidewall lugs off the pavement. What mtbcoach and I do is put enough in to lift the side lugs off and run primarily on the center tread pattern which is a smoother, quieter ride. Also, with certain rubber compounds, you can tear off those side lugs under high speed turns.

I think you'll just have to do a your own empirical testing (trial and error) to find out what works best. Also if you are going to run them daily, then you will need to find a compromise between 1) even wear, 2) smoother ride and 3) balance.
Well said...

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