Is the stud you are measuring brand new or has it already been pressed in? The knurling on my dorman studs measured .563-.570 depending on where you measured but it was obviously crushed from being pressed in.

 

It was one that was pressed in. The ARP stud was not going in. A 12 ton press got it about 30% in with significant amounts of metal collecting in front of the stud.

 

A Les Schwab once pressed a too-big stud into one of my hubs. They must have had a more manly press than you do, because it went all the way in but deformed the hub outwards. That was the end of that track day.

--Ian

 

guys, that was my car... and a couple of things worth mentioning...

That was my 1st Spec miata. It had been a spec miata (100% original engine, trans and rear hubs when I bought it in 2007 after being a spec miata since early 2000 and over 38k miles including 2 10 hour enduro races before I ever saw it)

I had 3 left side crashes (1 per year) since owning it and although visually checked the hubs after the crashes, never saw any cracking and didn't think to change the rear hub and bearing (no play so why change what didn't appear broke?)

..so in summary, 3 left rear crashes, over 45k track miles with 89k on the odo probably overdue to change the left rear hub especially after the hits!

I did (just for piece of mind) change the right side hub after the fact so the 'new owner' shortly after this incident got all new hubs and bearings at all 4 corners!

 

...and Rockauto fail, again. I also got one Taiwanese and one Chinese hub. WTF.

Can anyone out there offer any input on the apparent durability of the Dorman hubs under extended track use (so far)?

 

@1:40 mark

 

Wow! Just wow!

 

Whose rear hubs? OEM, old V8R, or new 0.500" V8R?

 

OEM/new. he's guessing around 30 hours. 400whp/2700lb/NT01's.


Past month I changed out both rears. Halfway through a track day drivers side had developed a hellacious howl. Shop said the hub had cracked 3/4 around the flange and it fell apart during disassembly. Unknown mileage OEM hubs, I put on 60-70 additional hours on them. 200whp/2350lb/all on 200TW rubber except 6X20 min. W2W on SM6's.

 

Whi makes the best hubs out there?

Which ones are more prone to fail - front or rear?

D

 

Wow.

I just ran LRP last week and started getting a high speed vibration that felt worse than just picking up some marbles on the tires. I'll be checking driveshaft, rear end, axles AND HUBS before driving it again. Best case its warped rotors/pad transfer from me throwing new DTC-60's on rotors that are almost to minimum

 

My rear hubs are at about 185,000 miles.

Front hubs probably at 25,000 miles.

 

RIP Fooger

 

BUUUMMMPPP!!!

Adding my name to the list.

Thank goodness, no video, but I do have pictures:







Both sides had circumfurential cracks all the way around. On the passenger side, the cracking was only evident on the outside. But on the driver's side, cracks had gone all the way through. I honestly have no idea why this didn't launch a wheel -- but I'd rather be lucky . . . .

 

Yuk.

 

Scary stuff. This inspired me to put my blueprinted rear knuckles from my spares box onto my car.

 

Just thought I would add some info on my hubs for the database:

Original to the car Mazda OEM hubs.

92,000 miles on the chassis. 30,000 miles Auto-X/Track. This has been a dedicated Auto-X/HPDE/TT car for a number of years. No W2W. No crashes. Just track duty.

135 RWHP.

2400 pounds with fuel and driver.

949 BGK and R-Comps. Normal cornering G's around 1.2 to 1.3.

Also, in my case the cracks appeared first on the outside surface where it is easy to see once the brake disk is removed. The last time I did this was 1.5 years ago when I reverted back to OEM disks from a first gen Goodwin rear BBK. At that time, the hubs were wire brushed and no cracks were observed. From here on out, I'll be inspecting every time I change rear pads.

 

Wow. Good catch. Regular inspections are now on the must-do list.

My 2.0 build is a 180k mile chassis, so new rear hubs are now on the happens-before-first-track-day list.

 

I am gonna lump rear inspection in with fronts. Every 3 track days seems wise given the consequences.

 

FTFY.