Originally posted by gen5 in short, to make your lug centric aftermarket wheels fit better on your car.
No, not better, fit PROPERLY...
From Jackson Racing....
Obviously, there's more to chossing wheels than bolting on a new style. In fact, the wrong wheel/tire combination can actually make your car dangerous to drive, and damage the suspension. So, to stay out of trouble, you should consider a few key areas, then make an informed decision.
Construction of the wheel hub is critical. A wheel will bolt onto your Honda or Acura if it merely has the correct offset and bolt pattern. But for proper operation, it must also have the correct "hub center". This hole is the middle of the wheel should be a snug, precise fit over a matching surface on the hub, thus ensuring the wheel's exact, "hubcentric" position. If it's a loose fit, the wheel is likely to be installed slight-off-center, and can often result in a serious out-of-round, out-of-balance vibration at common vehicle speeds.
Unfortunately, hub center design is one area where most wheel manufacturers let you down. In order to make one rim fit several different cars, they enlarge this hole by as much as 3mm - great for their profits, but not your car. Know anybody put Enkei, MSW, Ronal, Centre, Riken or other big-name wheels on a Honda or Acura, then had an incurable vibration between 60 and 70mph?
This article was use in court to win a case for TalonTire.com in the past.
Again, it's your car, your money, your decision, your risk...
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