Michelin LTX M/S2 285/75-16 install

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S

SL404

10 Year
Joined
Oct 25, 2012
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Location
Atlanta
hi, I recently replaced the stock tires on my hundy with the above that are a size up. My truck has various mods but is around the same weight as stock. Ive been trying to figure out the best air pressure for highway driving. Sidewalls say up to 80psi but every time I get my oil changed, the techs seem to lower the pressure down to 35psi. Its a constant back and forth.

From driving I seem to think that 70 psi is too rough of a ride and 30 is maybe a bit low for pavement driving, but this is from unscientific research.

Has anyone determined what psi they like to run on pavement?

Thanks in advance- Scott
 
35-40 PSI COLD (that's the coldest part of the day when the vehicle is cold) is what I do. I only run 50 PSI in my spare. The sticker on your driver door jamb is a good guide for on-road tire pressure.

You have to also consider what the vehicle suspension is set up for. Vehicles are designed to a specific size tire and tire pressure. Higher pressures or stiffer tires lead to the suspension needing to absorb more.
 
Try 42psi. if that's to soft add a few pounds, if the ride is to stiff let some air out. Rinse and repeat. Just find a pressure that makes you happy, then
watch the tread for wear patterns. Feathering is a sign of under inflation, cupping is a sign of over inflation. You can usually catch either problem before the tires are seriously damaged if you keep an eye on it.

My 285/75 R16 LTX AT2's like around 45psi. although I notice a little feathering the other day so I might bump that up a bit.
 
Same here. My tire guy put 32 psi in 285/65r18 Toyos when he put them on the rims. Drove like a pig until I bumped it up to 42 psi. Now up to 48 psi after the chalk test. Keeping an eye on tire wear for now.
 
rusty_tlc said:
Just find a pressure that makes you happy, then
watch the tread for wear patterns. Feathering is a sign of under inflation, cupping is a sign of over inflation. You can usually catch either problem before the tires are seriously damaged if you keep an eye on it.
Click to expand...

Cupping & feathering usually aren't the result of over or under inflated tires. Not to say that it can't happen, but it's usually indicative of alignment, worn/bent parts, or balance issues. I only bring it up in case someone is trying to fix cupping/feathering with tires pressures alone.
 
TXLX100 said:
Cupping & feathering usually aren't the result of over or under inflated tires. Not to say that it can't happen, but it's usually indicative of alignment, worn/bent parts, or balance issues. I only bring it up in case someone is trying to fix cupping/feathering with tires pressures alone.
Click to expand...
When I say cupping I mean symetrical wear in the center of the tire. When I say feathering I mean symetrical wear on the outer edges.
 
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