Quote:
Originally Posted by qqzj
2. The minimum thickness necessary to machine a lip for being hub centric is 6mm.
What do you mean exactly in this sentence? Does it mean since I still have 7mm hub extended out of the spacer, adding a 3mm spacer is still hub centric. but adding a 5mm won't be since only 5mm is left?
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What I said comes from my discussions with Motorsport Tech (I own many spacers from them in various sizes). It's about the machining process, has nothing to do with how much hub face will be exposed in a given size spacer.
Hubcentric means that the spacer is sized such that it's center bore matches the hub, and it provides a bevel on which the wheel's center bore sits. Most aftermarket wheels have a larger center bore than the size of your hub so you use hubcentric sizing rings to bring it into line (for instance commonly 73.1mm or 65mm for center bore of aftermarket wheels, our cars have a hub diameter of 56.1mm).
You can run up to a 5mm spacer on stock studs, however I think that's kind of sketchy and most of the better quality 5mm kits include slightly extended studs (like H&R Trax+). 3mm though does not need extended studs at all, nor do they need to be hubcentric, because the lip of the hub face will extend past the spacer.