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Originally Posted by Rotary Related
Adding a spacer does not change the offset of the wheel it just moves it out further from the hub face. The wheel remains the same. If you used a wheel that was the same offset as the "effective offset" as he mentions it would be constructed completely different.
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thats only really true for multi piece wheels that use the same face with a different barrel. 18x9.5 +38 and +15 rpf1's, for example, look identical from the outside. obviuously some wheels are shaped differently, but some arent.
in fact if brake clearance is an issue, its easier to fit wheels WITH a spacer. run a higher offset wheel with spokes designed for opem brakes, then space it out to clear big brakes. low offest deepdish whateverthehells are much harder to fit over BBK's.
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Your going to get some kid with a huge spacer and a wheel held on by a couple threads of wheel stud. Then his studs will break possibly causing a crash and destroying his vehicle if he's lucky and possibly injuring himself or others in the proccess if he's unlucky.
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thats a different argument. "how many threads should i have engaged?"
well its really not much of an argument. a fastener needs 1/2 of its diameter engaged to be equal in radial and axial sheer strength. for a 12x1.5 threaded stud, that equals 4 turns. stick with 5 to play it safe.
need more thread engagement? these are a hell of a lot cheaper then custom built wheels:
http://www.jegs.com/i/ARP/070/100-77...oductId=747558
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Also using his method causes accelerated wear on the wheel bearings since the load is now being carried out further from the bearing.
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the location of the center of the tire (scrub) is all that really matters in bearing load, as well as the load itself of course. whether it be a +10 wheel, or a +40 wheel with 30mm spacer, the bearing doesnt know the difference.
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You need as much of the mass and inertia centered over the bearing as possible to reduce this. This is just common sense you don't need a doctorate in physics to understand this.
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you think wheel weight has any affect on your bearings? they're designed to support cornering forces of an entire car... maybe your wheels weigh 1000lbs? i guess thats possible with multipiece steel wheels lol
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Some sactioning body for racing DO NOT allow spacers for these reasons.
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just about every time attack car runs slipon spacers, fyi (since most of them run 1-piece wheels with OTS offsets)