285/75/16 tyre pressure - Defender Source
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  #1  
Old August 17th, 2014, 01:09 PM
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285/75/16 tyre pressure

Hi,
I just fitted Duratrac 285/75/16 (7J16 E33 rim) on my 1984 One Ten V8.
Any advice about tyre pressure front/rear ?
Thanks.
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  #2  
Old August 17th, 2014, 04:45 PM
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John B.
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No but they will hit the rear spring perches during articulation. You need less offset.
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  #3  
Old August 17th, 2014, 05:50 PM
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Zack
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Chalk test it
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  #4  
Old August 17th, 2014, 06:42 PM
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Jimmy
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I usually run 34 psi in the front and 38 psi in the rear. I did the same on my 110 with 235/85's
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  #5  
Old August 18th, 2014, 01:13 PM
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Thanks,

I have 30mm aluminium wheel spacers .
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  #6  
Old August 18th, 2014, 01:14 PM
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Do the chalk test!!! Every vehicle is different.


"
You can also “calculate” your tire pressure with the chalk method. This involves coloring a section of your tire with chalk to see how much tread is making contact with the ground. Start by finding a flat road surface. Concrete is actually the best choice, but you can also do this on asphalt. Make a mark with soft chalk that goes all the way across your tread. Then, gradually drive your truck forward about 50 feet and then backwards 50 feet.

Analyze the chalk on the tire. If the chalk is only worn off on the center of the tire, reduce the tire pressure slightly and go through the process again. With the adjustment, you should see the chalk wear off more broadly. Keep making tiny adjustments in the tire pressure until the chalk wears off evenly and all the way across the tread.

You will have to complete this process for each of your four tires. Once you’ve found the right street pressure, add 10% to all four tires. Then, measure the tires and add pressure to balance them. As explained above, you need to measure from the wheel to the ground. Start by balancing the profiles of the front tires with each other. Then, balance the front tires again with the rear tires. Always adjust the tires with the smaller profiles by adding air."
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Old August 18th, 2014, 03:12 PM
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Luis Constantin
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Can't find where I read this.
Ideally, a tire is properly inflated if it increases by 4psi after driving on them.
An increase of 3psi or less is overinflated.
An increase of 5psi or more is under inflated.
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