Tires..again

[etlsport]

http://www.vehicross.info/gallery/sh...php?photo=3927

[ScottinMA]

that was fast! Thanks Etlsport..my curiosity has been quenched and I'm in for the big paws.

[NYVX]

geolandars installed...look great!....with the 285/60/18's...trimmed less than an inch wedge from passenger side cladding, was not rubbing on drivers side , but was so close, trimmed 1/2 wedge, JIC

been searching for tire pressure used in theses larger tires...no mention of these geolandars but the nittos seemed to run 38, 40 and 45 from threads I have seen

...tire installer said 32 lbs, tire rack said use manufactures # EVEN with any larger tires. installer logic was taller side wall would flex more , but after thinking a bit , seems since i stayed with 60 series..still same ratio of sidewall?
feel tireracks answer is from their lawyers, not tire experts...Any 285/60/18 geolandars and others willing to chime in?

[Ldub]

The sidewall height (aspect ratio, I believe, in tire industry terms) increases with tread width.
A 60 series tire has a sidewall height approximately 60% of the tread width.
A 50 series is 50% & so on.
Wider tread = taller sidewall.
I'm running 285/75 R 16" & keep em' at about 45 psi in summer for a little less rolling resistance & will be dropping them down to about 35-38 psi for a little better traction this winter.