[CSG Mike]

Originally Posted by Captain Snooze

Ummm... Pardon me but what am I noticing?

Excellent response answered the question for me!

Originally Posted by jamal

I have never liked the way the wilwood rotors go together. IMO the reason this happened is because there is zero float and no ability for the rotor/hat interface to compensate for thermal expansion or a slight misalignment.

Most other two piece rotors use a drive pin with float which allows the rotor to expand independently of the hat as well as reduce brake piston knockback. The wilwood hats are just straight bolted on there.

Here's a nice post by essex that explains the difference with more detail
http://www.essexpartsblog.com/news/f...ng-brake-discs

And Stoptech has some pictures of their mounting system here:
http://www.stoptech.com/products/rot...ch-aero-rotors
and more here: http://www.zeckhausen.com/StopTech/R...eplacement.htm