This is a great discovery GeneSplicer! I am not worried about the loss of spline length. If for some reason it did fail at least it's not catastrophic like the way they currently fail.

I run the sticky HooHoo's and would welcome the greater piece of mind these would offer.

That radius on the base is sexy.

/IBSubscribed

So I got one of these on hand now, from my measurements this is what's needed.

The wheel stud knurl OD is .507" so a Miata specific stud will work. A 1mm or .040" shim washer is needed between the bearing and the hub to get the rotor centered in the bracket. Then both the splines and the overall length of the bearing snout will need to be shortened to fit the Miata spline length. I don't have a spare axle to give measurements but this confirms to me that this will work.

I'm - or my machinist - is almost done with a pair of machined hubs. Is gonna work no problem. Best thing is, none of the machining is done anywhere that might effect strength - other than in the splines. I hope to have completed n installed pics soon. Now just to find some extended apr studs to press in. I had trouble finding them for the mr-s front hubs (keisler).
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Just use the Miata specific front studs with the. 507" knurl.

Now to press in extended studs and install into my Keislers :) more pics to come. https://cimg6.ibsrv.net/gimg/www.mia...724492f6bf.jpg
https://cimg7.ibsrv.net/gimg/www.mia...022f2093da.jpg
https://cimg8.ibsrv.net/gimg/www.mia...d404715455.jpg
https://cimg9.ibsrv.net/gimg/www.mia...8ca9935a77.jpg
https://cimg0.ibsrv.net/gimg/www.mia...ae51ca9d0a.jpg

Oh yes - as I stated before - miata ARP extended lugs wont work​​​​.
The ID of holes where the mr-s oem lugs came out are .550 (the other 4 empty holes measure .595"), and the mr-s knurled lugs measure .560, Mazda knurled lugs are .580 (.020 too large)... soon as I match up ARP lugs I'll let y'all know... or you could just rock on the mr-s lugs as is (same thread pitch as miata).

Why wouldn't we just use the mr-s lugs as is?

Absolutely so - I just want ARP extended lugs

Try the mitsubishi extended lugs mentioned in the "when was the last time you changed your rear hubs" thread. ARP part #7717 if I remember correctly.

If your machinist is up for churning out a plug and play solution, I'm in for a set, I don't have a local machinist I trust.

He says supply your hubs of choice - he'd do them at $50/hub.

Any word how these have worked on track or even on the street? Any issues at all?

Sorry man - not subb'd to my own thread!
I haven't gotten my Eliminator back from wiring/tuning, but when I do, it's one of the first things to swap in.

So for anyone asking, I don't care if you market these or make them yourself. I left the dimension details with my machinist - so if you want exact dimensions of what needs to be done, just pay him to knock you out two... or break out a pair of calipers and mic it out. It's really not hard to figure out what needs to be done. I'm just trying to throw him a little business since he's the one that did all the hard work. I might have discovered this, but it's a free for all as far as I'm concerned :)
If my machinist doesn't care one way or another, I'll list the specs... yeah, I put money into the discovery - but I got a nice pair of mr-s hubs outta it, so I'm happy :)

Follow up - he doesn't care and has limited time to actually work on this anyway. I'm not interested in making money on this so in the spirit of MiataTurbo, I'll post the specs (when I get them) on the modifications needed to the MR-S hubs for them to work - based off OEM hubs (others might be different).

Stoked!

Awesome, I think i'm gonna try this. Especially since i have a lathe and tools available.

Take my money

Let me practice and ruin mine first.

I have a set right now for Marcus, im r&d-ing. Sadfab will probably be offering these soon enough. Ill probably write up a how to as well.

Very interested in this, timing is perfect since it's time to change the rear hubs on Creampuff.
Did you ever find which ARP studs work in the MRS hubs?