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Paul Woodward
New Member
2 Posts |
 Posted - 01/07/2011 : 12:02:47 PM
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When changing out OEM tires for non-OEM larger tires, is there some official language to follow on tire pressures to go by other than the side wall?
Typically, the OEM tire specs and recommendations would be on the vehicles door jam and that is fine, but what psi sepcifications is one to follow when larger non-OEM tires are exchanged? for example the non-OEM tire (max cold)pressure on the side wall has changed, and it now reads '80 psi cold" for this larger heavy duty type tire instead of 44PSI(OEM door jamb).
Should the recommended psi for the vehicle still be what the door jamb label recommends?
This is assuming the vehicle has not had any additional weight added.
If weight is added to the vehicle, then driver would air up to the max cold presure recommendatiomn on the sidewall.
Thanks.... |
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Wolf0r
Top Member
USA
2181 Posts |
Posted - 01/07/2011 : 1:00:25 PM
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| I would take that up with your tire vendor. There and numbers and tire codes that you need to check. My guy usually tells me the "recommended" pressures to run. |
“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson |
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matts4290
Advanced Member
224 Posts |
Posted - 01/07/2011 : 5:01:32 PM
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| Sounds to me like you went from a Passenger (4 ply) or a LRC (6 ply) tire to a LRE (10 ply). If you are not adding weight, I would only put the tires up another 5 or 10 lbs from what your sticker says. Since you aren't adding weight, if you air it up to max pressure, it will be a rough ride and the tires will tend to wear out in the center of the tread first. 65PSI is max for a LRD (8 ply) tire. |
We can't all be conventional!
http://www.youtube.com/user/matts4290 |
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Cal Mc
Advanced Member
303 Posts |
Posted - 01/08/2011 : 07:31:50 AM
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Google michelin truck tire load inflation tables.
Michelin has an excellent table for that information. Other manufacturers probably have something similar. |
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PTJ
New Member
5 Posts |
Posted - 01/08/2011 : 5:11:07 PM
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| The max cold is only the maxium inflation amount recommended for the tire if it is going to be carrying its max load. Usually the max is approached on single wheel positions. A 10000 pound rated rear axle with single rear wheels would recomend inflating the tires to each carry 5000 pounds. A 10000 pound rated rear axle with dual rear wheels would only need the tires to carry 2500 pounds each and would need much less inflation. If you knew you only carried 6000 pounds you could adjust the inflation to carry 1500 pounds, there is a max low inflation also. The recommended air pressure dosen't change much, if any, by going to a high load rated tire. 44 PSI on the LRD rated tire will probably be the same on the LRE tire. Go to the manufactures web site and look for their tire data info. Dont use Michelins inflation recomendation for a Bridgestone. Sometimes the manufactures use different pressures for the same size tire in a different tread or construction design. |
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Paul Woodward
New Member
2 Posts |
Posted - 01/13/2011 : 12:18:16 PM
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| Thank you to all who provided the excellent information. I just don't want this topic to end up sounding like 'rocket science':-) |
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bwest
Administrator
United States
3820 Posts |
Posted - 01/14/2011 : 09:26:04 AM
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quote:
Originally posted by Cal Mc
Google michelin truck tire load inflation tables.
Michelin has an excellent table for that information. Other manufacturers probably have something similar.
This is good information, thanks. I still have a little reservation runnig a 11R22.5 at 75 psi. At least that's what the chart says to run if you have no more than 18,320 lbs. and that is the lowest they have listed. That would be over 36,000 on the rear axle right? Or is that 18,320 for the entire rear axle? |
Bryan |
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changing out OEM tires for nonOEM larger tires
