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Jeep Wrangler JK
JK General Discussion
Tire air pressure
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<blockquote data-quote="Duster" data-source="post: 461071" data-attributes="member: 20812"><p>The chalk test is a pretty useful tool. Draw a series of parallel lines across each tire. I've used anything from three to five lines. Then drive down the street, or in a big, mostly empty, parking lot for a couple of hundred yards at least. Then inspect the sets of lines on each of the tires. If the lines are gone from the central portion of the tread, but not from the edges, your pressure is too high. If the lines are missing from the edges of the tread but still noticeable in the centers, the pressure may be low. What you want to see is even removal of chalk across the entire tread width. The maker's recommended pressure is on the placard on the driver's side door or B-pillar. But . . . that pressure is for the factory issued tire size. My JKU Rubicon Hard Rock came with 255/75R17s, which are the same as 32.1 X 10R17s. When I bought it used, it was wearing the same size. I keep mine around 35 PSI. The TPMS doesn't complain until the pressure drops to about 32 PSI.</p></blockquote><p></p>
[QUOTE="Duster, post: 461071, member: 20812"] The chalk test is a pretty useful tool. Draw a series of parallel lines across each tire. I've used anything from three to five lines. Then drive down the street, or in a big, mostly empty, parking lot for a couple of hundred yards at least. Then inspect the sets of lines on each of the tires. If the lines are gone from the central portion of the tread, but not from the edges, your pressure is too high. If the lines are missing from the edges of the tread but still noticeable in the centers, the pressure may be low. What you want to see is even removal of chalk across the entire tread width. The maker's recommended pressure is on the placard on the driver's side door or B-pillar. But . . . that pressure is for the factory issued tire size. My JKU Rubicon Hard Rock came with 255/75R17s, which are the same as 32.1 X 10R17s. When I bought it used, it was wearing the same size. I keep mine around 35 PSI. The TPMS doesn't complain until the pressure drops to about 32 PSI. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Tire air pressure
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