A: Rotors that pop off when the wheel is undone (except for the caliper holding them from coming all the way off) are called floating rotors. The wheel studs and center hole align them and the wheel nuts keep them in place. Floating hubs is a different story! (some early 2wd Cherokees had a hub and spindle like the RWD cars mounted to the same knuckle as a 4x4. I had one I packed along for a spare hub in case I broke and axle/bearing or something while 4 wheeling in my '86 Comanche) From: farna@xxxxxxx To: mail@xxxxxxxxxxxx (AMC-List) Subject: Re: More on Disk swap on 72 Gremlin Date: Wed, 19 Jan 2005 10:53:26 +0000 Message-Id: <011920051053.29767.41EE3C26000170460000744721603831160E029D0E00@xxxxxxx> Jim, I'm not familiar with a "floating rotor" design. The 91 Comanche 4x4 I had used regular rotors that came off like front drive rotors, only deeper offset (would make perfect rear reotors for AMCs!). Are the front rotors that much different on a 4x4? I've seen a few other 4x4 trucks, but never anything with a floating rotor (mostly 70s 4x4s). I would assume the rotor can move on the studs or whatever holds it in place??? Wish I had my TSMs with me!!