I have a 96 Monte that needs new front brake rotors, seems simple, so I thought.
I went to my local auto parts store and purchased a new set of rotors, nothing special, just an OEM replacement. Got the rotors installed and when installing the wheels I notice I only have about 3-1/2 threads into the lug nuts . I take everything back apart and notice that the centers, just the part over the hub, of the new rotors are about .160" thicker than the originals. I don't like the feeling of only 3-1/2 threads so I return the rotors in hopes that the "premium" brand rotors would be like the originals but they weren't. All the replacements I'm finding are 1 piece cast rotors and my originals are the composite type with a thin steel center.
My car has the original wheels, wheel studs and lugnuts. I can't be the first person to discover this problem with as popular as these cars are but no one around this area has an answer.

Has anyone seen this problem before?

 

WOW! That's a new one for me. Maybe someone else has run into that before. You have composite rotors? Never heard of that.

 

I replaced my rotors with the "one piece" style you are describing and had no problems whatsoever getting them to fit.

 

I dont know anything about what you're talking about, but I can tell you, if you log on to I think its partstrain, and act like you're interested in buying somthing, they will give you all the info you will ever need. Just somthing to think about if you cant find what you're looking for? you know, the live chat>

 

Thats actually a good idea. I think hitting up one of those live chats might be a good idea for this question...

I have never heard of this before, intresting...

 

Unless I'm wrong I thought composite rotors were the 2 piece design that has the cast iron friction surface with a steel center.

 

I went to a dealership today and ordered a set, they told me they will be exactly what came on it when the car was new. $64 each

I'll know in a few days if they are correct