I just took some quick measurements on a late rear hub, and came up with a minimum dimension closer to 63.25mm. I also noticed a step near the face of the hub.
I have MN-12 rear hubs and Cobra rotors and wheels around the shop, so I could certainly make a pair from Delrin, but they'd have to be somewhere around $60 shipped to make it worth my time.
I deleted all innacurate information above.
I found my old 94 hubs and 90 Front hubs. They all measure the same where it meets the rim. The rotor locating step is different though and much larger on the early hubs. So all MN12 wheels have the same hub bore size at the wheel.
Then rings supplied by Brads shop are too big, Not sure if it was a manufacturing problem or what. I found a set of old centric rings that I used when I had superior scoundrels. And those fit the T-bird hubs near perfect, but the superior wheels were much larger around the hub bore then the Mustang cobra R I have. I could maybe send you these old rings to you Doug to maybe machine them to the smaller 70.8mm Mustang size, not sure how much you would charge for that.
I think there is evidence that for some reason some manufacturers belive we have 63.9MM hubs, As you can see they advertise that is our size.
http://www.ezaccessory.com/Hub_Centric_Ring_O_D_73_I_D_63_9_p/hcr106-4.htm
But like Doug found out those measurements are not even close, 63.36MM Hub diameter is closer to what we have Prestige Wheels carries the 63.36MM ID but dont have a matching 70.8 OD
http://www.prestigewheel.com/mainHubRing.htm
The old rings are Polycarbonate plastic too.
I only need rings to center the wheels, I got the rotor issue figured out Im using a late set of rotors for the rear that matches to the hub.
I had the rear hubs redrilled so I already have the mustang pattern, if I do mustang hubs in the rears then ill have to spend money on relocating brackets and upping to the cobra rotors, Then the brakes will be slightly disproportional. Im using the stock calipers up front with stock sized mustang rotors.
Cant you just use factory mustang rear rotors with the swap??
Or redrt
The old rings are Polycarbonate plastic too.
I only need rings to center the wheels, I got the rotor issue figured out Im using a late set of rotors for the rear that matches to the hub.
I had the rear hubs redrilled so I already have the mustang pattern, if I do mustang hubs in the rears then ill have to spend money on relocating brackets and upping to the cobra rotors, Then the brakes will be slightly disproportional. Im using the stock calipers up front with stock sized mustang rotors.
No PM or nothin...Nice
Do you exp. vibration using the rings?? They are intended only as an alignment tool. If you dont like/want them return them.
I think Polycarbon is most common because if the wheel comes loose for whatever reason you dont have a piece of Metal in there chaffing or fretting your wheel. I actually had some rear studs break off and the wheel came loose. It should have destroyed the wheel, but the ring kept the wheel from hitting the hub and left zero damage to the wheel lug pockets and hub-bore, etc...Needless to say I was pretty impressed already expecting the wheel to need replaced.
63.90 was always documented as the standard and I never questioned it. Regardless there are ALOT of people, including myself running them with no issues. The next ones I have built will be machined to 63.50mm.
Brad