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What is the purpose of doing something like this?
The smaller radius bit makes it easier to get the wheel on in the first place. The fatter inner bit holds the wheel accurately in place once you've got it on.
Brommers-
But then the crucial measurement should be the "fatter inner bit" right? Bit weird since that measurement was listed in a parentheses? So are all hubs made like this with a wider ridge with a degree of slope with a corresponding slope on the rim? (havent really been paying attention when changing wheels on cars b4).
badboybjorn
So im just about ready to order a spacer to test and then a 2nd if its turns out ok or 2 new if i need to do some adjustments.
Also managed to dig up an old email from maserati with info on my original wheels.
I noted they listed the center bore at 58.6mm but also a "countersink" with 59.5mm
What is a countersink in this application i wonder? Had to look around and i was "smart" enough to take some photos of the hub when at the tire shop. And as seen in the close up below it look like maybe not all of the hub is 58.6 but the part closest to the car looks like it could be a little wider ridge? What is the purpose of doing something like this? Hard for me to see a point other than to make sure its really difficult to fit any other wheels and make things a pain in the ass :) or is there an engineering advantage somehow?
But since im putting a spacer over this anyway it may not need to be brought any attention?
Also measured the center bore on the new wheels and i get a range of readings between 57.98 to 58.10 or there abouts. So they are about .5 mm more narrow than the original wheels. They also seem to have that slightly angled edge to maybe fit the "countersink" or maybe all wheels have this as its easier to fit the wheels on the hub this way.
The combo just seems so close to the original so its hard to see why the would make a change this small.. why not just keep the same specs as the earlier wheels i imagine it would be much cheaper for them which makes me think they could be 58.6 but with some paint? But also they appear to be bare aluminium when i take i look and the shop dident think it was paint either, well one of them thought maybe the other said no! :)