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Jeep Wrangler JK
JK General Discussion
Spare Tire Offset Questions
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<blockquote data-quote="Dirty Dog" data-source="post: 457470" data-attributes="member: 24042"><p>You've got it backwards. A wheel has always been a wheel. A rim is (and always has been) the outermost portion. Originally it was the metal rim placed on a wooden wheel to keep the wood from immediately falling apart. Now it is the outermost portion of a wheel, that contacts the tire. A wheel and tire are... a wheel and tire. You've just been using the wrong terminology longer than most.</p><p></p><p>I have a matching wheel on my spare, yes.</p><p></p><p>No. Tire rotation is intended to balance out uneven wear between tires. If my tires wear unevenly, I fix whatever is causing that to happen. So I do not rotate my tires; they wear evenly. 60 years ago, manufacturing tolerances were significantly looser, and tire rotation was absolutely necessary. Not so today. I think people do it because they've always done it. I call it cultural inertia.</p><p></p><p>It is impossible to tell what backspacing and offset you have from pictures, but I suspect you have inadequate backspacing which someone tried to correct by using spacers. Nasty.</p><p></p><p>Wheel offset is the distance from the mounting surface to the centerline of the wheel. On the other hand, backspacing is the distance from the mounting surface to the wheel's back lip. And the only way to find out what you have is to take them off, break out a straight edge and a ruler, and start measuring.</p><p></p><p>With 35" tires on a JK, you want about 4.25" backspacing and an offset of +25 to +50. This will minimize rub and maintain proper alignment and avoid premature failure of suspension components.</p></blockquote><p></p>
[QUOTE="Dirty Dog, post: 457470, member: 24042"] You've got it backwards. A wheel has always been a wheel. A rim is (and always has been) the outermost portion. Originally it was the metal rim placed on a wooden wheel to keep the wood from immediately falling apart. Now it is the outermost portion of a wheel, that contacts the tire. A wheel and tire are... a wheel and tire. You've just been using the wrong terminology longer than most. I have a matching wheel on my spare, yes. No. Tire rotation is intended to balance out uneven wear between tires. If my tires wear unevenly, I fix whatever is causing that to happen. So I do not rotate my tires; they wear evenly. 60 years ago, manufacturing tolerances were significantly looser, and tire rotation was absolutely necessary. Not so today. I think people do it because they've always done it. I call it cultural inertia. It is impossible to tell what backspacing and offset you have from pictures, but I suspect you have inadequate backspacing which someone tried to correct by using spacers. Nasty. Wheel offset is the distance from the mounting surface to the centerline of the wheel. On the other hand, backspacing is the distance from the mounting surface to the wheel's back lip. And the only way to find out what you have is to take them off, break out a straight edge and a ruler, and start measuring. With 35" tires on a JK, you want about 4.25" backspacing and an offset of +25 to +50. This will minimize rub and maintain proper alignment and avoid premature failure of suspension components. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Spare Tire Offset Questions
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