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Jeep Wrangler JK
JK General Discussion
2017 Sahara JKU tire question
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<blockquote data-quote="Snowbird Tom" data-source="post: 464446" data-attributes="member: 24869"><p>Doing a bit of digging on your current tire diameter of 255/70R18 shows about 32" tall with a 10' width. Going up to 285/70r-18 gets you about a 33" tall tire with the same width. Like BlackJKU says, recalibrate for your speedo and transmission to work properly. I'd recommend talking with someone at a good tire store about recommendations. They're pretty experienced with tire size changes.</p><p></p><p>Going one size up should have very minimal effect on the spare tire mount. A pound or two difference is negligible.</p><p></p><p>ETA: also do not assume the max inflation pressure is correct. Do a chalk test to determine proper pressures. Google for the video. Pretty simple check, honestly. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3993" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Snowbird Tom, post: 464446, member: 24869"] Doing a bit of digging on your current tire diameter of 255/70R18 shows about 32" tall with a 10' width. Going up to 285/70r-18 gets you about a 33" tall tire with the same width. Like BlackJKU says, recalibrate for your speedo and transmission to work properly. I'd recommend talking with someone at a good tire store about recommendations. They're pretty experienced with tire size changes. Going one size up should have very minimal effect on the spare tire mount. A pound or two difference is negligible. ETA: also do not assume the max inflation pressure is correct. Do a chalk test to determine proper pressures. Google for the video. Pretty simple check, honestly. :) [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
2017 Sahara JKU tire question
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