For that to use hats? Benefits?

[Wally]

Originally Posted by evilC

If you use separate bells (hats) and rotors then the advantages are:
1) the bells can be custom made to suit whatever offset you want to locate the brake rotor.
2) it allows you to select different thickness rotors to suit your calipers/application
3) it reduces the heat transfer to the hubs from the rotor
4) You can have fixed, semi-floating or fully floating rotors. Each has different advantages.
5) it is easier to select a custom brake set up as the bells have to be manufactured individually.

Its funny you didn't mention 'weight' as an advantage, as it was the first one that came into my mind and the only reason I would want a alu hat...

Any suppliers that use the porsche bolt pattern for their 10 bolts hat-disk?