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The Terminator
Suspension Modifications
Wheel offset/305's on SRA car require rolled fenders?
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<blockquote data-quote="DCguy" data-source="post: 16788941" data-attributes="member: 196849"><p>Well I can tell you the SRA 94-98 axle lengths are 29, 31/32nds and the 99-04 are 30, 11/16ths. So you're basically looking at around 0.72in difference on each side. With that, you should be able to get an idea on the difference between a 99-04 SRA and an 03/04 IRS, given what you already know.</p><p></p><p>The thing to remember is, there are many factors at play here when considering clearance and if you need to roll fenders. The main variable is the wheel itself, particularly the offset. If you have a lower offset (+10 vs +20 for example) the +10 wheel will stick out farther toward the outside of the car, therefore it will be less likely to rub the inner liner under the shock mount. Wheel backspacing will help you determine how far the rim will extend past the wheel hub toward the inside of the car. That won't account for tire clearance, but you will be able to determine if the rim itself would contact any body panels or suspension components. If yes, then you need a wheel with less backspacing ie a lower offset ( a +10 instead of a +20 for example).</p><p></p><p>Another factor is spring rate. If you run stiffer springs your suspension will have less travel and will be less likely to contact the tire with the fender. Also the ride height or how low the car is dropped will factor into this.</p><p></p><p>Then you have to account for tire height and width. A taller tire with a fatter sidewall or an 18in vs a 17in wheel will obviously sit closer to the inner side of the fender and can bottom out on hard launches or in hard cornering if you run a soft spring rate or the car is dropped too low and the springs are not stiff enough.</p><p></p><p>The best thing to do is take a few measurements, determine backspacing and then test fit a couple wheels to get an idea on fitment. Once you have that you can figure out what tire you want and can run next. Everything is a compromise, but if you understand what's going on you can fit an 11.5in/12in wheel on these cars with the correct offset.</p></blockquote><p></p>
[QUOTE="DCguy, post: 16788941, member: 196849"] Well I can tell you the SRA 94-98 axle lengths are 29, 31/32nds and the 99-04 are 30, 11/16ths. So you're basically looking at around 0.72in difference on each side. With that, you should be able to get an idea on the difference between a 99-04 SRA and an 03/04 IRS, given what you already know. The thing to remember is, there are many factors at play here when considering clearance and if you need to roll fenders. The main variable is the wheel itself, particularly the offset. If you have a lower offset (+10 vs +20 for example) the +10 wheel will stick out farther toward the outside of the car, therefore it will be less likely to rub the inner liner under the shock mount. Wheel backspacing will help you determine how far the rim will extend past the wheel hub toward the inside of the car. That won't account for tire clearance, but you will be able to determine if the rim itself would contact any body panels or suspension components. If yes, then you need a wheel with less backspacing ie a lower offset ( a +10 instead of a +20 for example). Another factor is spring rate. If you run stiffer springs your suspension will have less travel and will be less likely to contact the tire with the fender. Also the ride height or how low the car is dropped will factor into this. Then you have to account for tire height and width. A taller tire with a fatter sidewall or an 18in vs a 17in wheel will obviously sit closer to the inner side of the fender and can bottom out on hard launches or in hard cornering if you run a soft spring rate or the car is dropped too low and the springs are not stiff enough. The best thing to do is take a few measurements, determine backspacing and then test fit a couple wheels to get an idea on fitment. Once you have that you can figure out what tire you want and can run next. Everything is a compromise, but if you understand what's going on you can fit an 11.5in/12in wheel on these cars with the correct offset. [/QUOTE]
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Wheel offset/305's on SRA car require rolled fenders?
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