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Originally Posted by mjw930
I think you all are missing the point, there's no possible way to make a 5mm spacer that also extends the hub (like a hub centric spacer). The center hub that the wheels use to center themselves on extends at least 15mm on the Boxster. Anything short of a 15mm spacer will, by definition, not be a hub centric spacer.
Note the 3 tangs on the center of the hub in the attached picture. Those are the centering tabs the wheels use to center themselves. A spacer would have to be thicker than these tabs to require it's own hub center thus making it a "hub centric" spacer.
BTW, if you decide to mount a wheel that isn't machined with a 71.6mm hub center on the Boxster don't be surprised when the car vibrates the steering wheel out of your hands above 70 mph.
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No, no--I'm not missing the point, I'm mixing topics really, sorry 'bout that.
I wasn't really talking about hubcentric spacers specifically. I was talking more about wheels that aren't machined with the proper hub center and the things that people will normally sell you to alleviate that problem, being either hubcentric spacers or just hub centering rings.
So I was kind of refuting your final point there--I've had many different wheels on many different cars, both on a race track and not on a race track and even without the proper center bore they didn't vibrate. The cone-seated lugs center the wheel just fine. Any other vibration is usually a wheel balance issue.
But, I don't really know how well that works on the Boxster, all cars are different. I'd never buy wheels for the Boxster that didn't have the proper centerbore anyhow--why would you want to when there are so many wheels made specifically for Porsche, eh?
On another point, I've even raced cars that were using cheapo Pep Boys spacers that you have to kind of "feel" and get as centered as possible. Pretty iffy, but even that can be made to ride and race at high speeds if you're careful enough about it and don't mind the ghetto factor.
