Quote:
Originally Posted by KTL
Here's an example of a "fixed" two piece floating rotor that is not bolted together. E36 BMW M3 can be equipped with factory European Motorsport floating rotors, although currently no longer offered by BMW.
BMW also has a floater for the E39 M5, again a two piece non-bolted rotor for the European market
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Those are floaters, they are no more fixed than the 930s or Girodisks or PCCBs, the annulus floats radially on the pins. Fixed means there is a solid connection that has no play what so ever. Look at the 993tt rotors, the hat and rotor holes are circular and are a light friction fit for the bolts that hold the assembly together, the Girodisks and the like have oval holes, the 930s have the dog slots, the BMW pins serve the same purpose, they allow radial movement to accommodate thermal expansion.
here is a disassembled 993tt front rotor & hat, note the round holes in both, there is no float here
