I am gathering all the parts for my LS1 brake upgrade, after taking a closer look at my hub I got machined about a year ago I noticed that the wheel stud knurl diameter is larger then stock. I guess the rotors that I turned down used different size knurl diameter then stock. My main concern with the bigger hole is the strength of the hub.
Here are the measurements:
Stock Knurl Diameter: about .500 inches or 12.7mm
My Hub’s Knurl Diameter: .575 inches or 14.6 mm
Distance from stud whole to edge of hub: .3 inches or 7.62mm

Below is a picture of the stud that came with my rotors (left), the stock stud (right), and the hole size. Do you think there is too little material around the stud hole.

 

I would be tempted to redrill the hub for the stock size knurls. I agree that the ones that came with that hub may not leave enough material. This is even more so being that the hubs are cast.

I've been wondering if the stock 'vette hubs (such as C4's are forged or not).

RBob.

 

I personally don't see a problem with the thinness. Reason being that the studs you are using have a larger head on the backside than the .500 knurk stud do. That head flange areawill prevent the studs from pulling through in the unlikely event that the hub cracks for the stud holes to the outer edges. I would use them, however, I would inspect them after a short inteval of use (5k miles.)

 

I am confused. I thought that your hubs were just stock rotors that you had turned down. In that case, why did they touch the holes for your wheelstuds? Wouldn't you just want to use stock wheelstuds (or longer but otherwise the same replacements).

 

That looks like a noticable difference in the knurls but I haven't noticed that much of a difference in the studs I replace the stock ones with (Dormans). I only have to drill the hubs to install ARP studs and I don't think there should be that much of a difference in them.

Ed

(I hope that made sense...it's early...)

 

The rotors I turned down were stock rotors that I got from someone on this site. I assume that they came off a car that had it's rotors replaced with some brand that happened not to use the stock knurl diameter studs.

Ed, have you ever seen larger knurl studs on any of the rotors you turn down?

 

i didnt drill at all for my arps. no cracks going in, and none as of 30 miles

 

No, they have all been the same, either GM or aftermarket rotors. Also, that knurl diameter seems a bit big. I have to drill a .484" hole for the ARP studs I install so the .575" you listed seems wayyyy big.

Ed