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CCW offset help for solid axle car
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<blockquote data-quote="DCguy" data-source="post: 16946476" data-attributes="member: 196849"><p>The offset is more for determining the outside fitment ie the wheel lip with the fender. For clearance to your interior component ie shocks/springs/axle etc you need to determine your backspacing. Tire choice and how much you're lowered will also play a factor here. Lower the car the closer the inner fender will be to the tire, especially if you run a 40 series sidewall or ET street type setup.</p><p></p><p>99-04 axles is almost identical to an IRS so from an offset perspective you can run something very similar (+15 to +20). However, backspacing is very different since the IRS has more "stuff" you need to clear. That's why IRS guys usually run a 6.5in backspacing max whereas solid axle folks (99-04) you can run up to 7.5in comfortably and up to 8.5in with some minor clearancing. What this means is that we can run wider wheels. </p><p></p><p>I recently redid my rear axle and went through the measurement process to get the widest wheel/tire I can under there as I do intend to run the car pretty low.</p><p></p><p>Before:</p><p>[ATTACH=full]1805990[/ATTACH]</p><p></p><p>After:</p><p>[ATTACH=full]1805991[/ATTACH]</p><p></p><p>My rears are an 18x11.5in with a +22 and 7.1in of backspacing. I could easily have gone with 7.5in backspacing and had the wheels tucked in a little more but I wanted the option of running quad shocks. Here is how that clearance looks like. As you can see its pretty tight but with a 335/345 tire i'll have to check it again and adjust the quad or remove it. I have washers spacing out the quad body a bit since i've got rear coilovers and that makes things a bit more difficult. My rear spring rate of 275lb plus the added stiffness from the PHB should allow me to run the car quite low without worry of the tire contacting the fender.</p><p></p><p>[ATTACH=full]1805992[/ATTACH]</p><p></p><p>Money shot from the rear. Even with a 7.1in backspacing, the lips of the wheels are completely flush with the fenders. With tires on the tire will likely stick out about a 0.5in outside the fender but i'm fine with that. If you want the tires flush, run more backspacing and remove the quad shocks.</p><p></p><p>[ATTACH=full]1805993[/ATTACH]</p></blockquote><p></p>
[QUOTE="DCguy, post: 16946476, member: 196849"] The offset is more for determining the outside fitment ie the wheel lip with the fender. For clearance to your interior component ie shocks/springs/axle etc you need to determine your backspacing. Tire choice and how much you're lowered will also play a factor here. Lower the car the closer the inner fender will be to the tire, especially if you run a 40 series sidewall or ET street type setup. 99-04 axles is almost identical to an IRS so from an offset perspective you can run something very similar (+15 to +20). However, backspacing is very different since the IRS has more "stuff" you need to clear. That's why IRS guys usually run a 6.5in backspacing max whereas solid axle folks (99-04) you can run up to 7.5in comfortably and up to 8.5in with some minor clearancing. What this means is that we can run wider wheels. I recently redid my rear axle and went through the measurement process to get the widest wheel/tire I can under there as I do intend to run the car pretty low. Before: [ATTACH type="full" alt="IMG_0070.PNG"]1805990[/ATTACH] After: [ATTACH type="full" alt="IMG_0065.PNG"]1805991[/ATTACH] My rears are an 18x11.5in with a +22 and 7.1in of backspacing. I could easily have gone with 7.5in backspacing and had the wheels tucked in a little more but I wanted the option of running quad shocks. Here is how that clearance looks like. As you can see its pretty tight but with a 335/345 tire i'll have to check it again and adjust the quad or remove it. I have washers spacing out the quad body a bit since i've got rear coilovers and that makes things a bit more difficult. My rear spring rate of 275lb plus the added stiffness from the PHB should allow me to run the car quite low without worry of the tire contacting the fender. [ATTACH type="full" alt="IMG_1169.PNG"]1805992[/ATTACH] Money shot from the rear. Even with a 7.1in backspacing, the lips of the wheels are completely flush with the fenders. With tires on the tire will likely stick out about a 0.5in outside the fender but i'm fine with that. If you want the tires flush, run more backspacing and remove the quad shocks. [ATTACH type="full" alt="IMG_1170.PNG"]1805993[/ATTACH] [/QUOTE]
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CCW offset help for solid axle car
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