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Jeep Wrangler JK
JK General Discussion
J-Scan tire change broke speedometer and threw lots of codes
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<blockquote data-quote="Duster" data-source="post: 455930" data-attributes="member: 20812"><p>The tire industry for some reason sometimes refers to circumference as "Roll out" - <a href="https://ntwonline.com/tire-shop-talk/revolutions-per-mile-chart/" target="_blank">https://ntwonline.com/tire-shop-talk/revolutions-per-mile-chart/</a>. The chart makes the same point I was making. The circumference of a tire is to a degree affected by the load and inflation pressure, but that's critical estimate. Many sites for tire sales will give you all pertinent data for calibrating. You can check the speedometer on your TJ by finding some location that gives you a measured mile. Measure the time it takes to travel that distance a steady speed - back in the day we used a stop watch - and then do the arithmetic. On many roads there are mile markers that give you tenth-mile intervals. If you aren't being stopped for speeding repeatedly, you are probably good.</p></blockquote><p></p>
[QUOTE="Duster, post: 455930, member: 20812"] The tire industry for some reason sometimes refers to circumference as "Roll out" - [URL]https://ntwonline.com/tire-shop-talk/revolutions-per-mile-chart/[/URL]. The chart makes the same point I was making. The circumference of a tire is to a degree affected by the load and inflation pressure, but that's critical estimate. Many sites for tire sales will give you all pertinent data for calibrating. You can check the speedometer on your TJ by finding some location that gives you a measured mile. Measure the time it takes to travel that distance a steady speed - back in the day we used a stop watch - and then do the arithmetic. On many roads there are mile markers that give you tenth-mile intervals. If you aren't being stopped for speeding repeatedly, you are probably good. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
J-Scan tire change broke speedometer and threw lots of codes
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