Bob W.

...I looked at it a little closer, and I'm not so sure it's a wheel spacer. It appears to be part of the rotor itself. Here are a few pics....the first one shows the embossed part, which in hindsight is probably referring to the min. thickness of the ROTOR, not the spacer (duh):
<img src="http://pictureposter.audiworld.com/414/spacer_thick.jpg">

But it does definitely stick out beyond the surface of the rotor. Here's a (blurry) shot of the front rotor, where it meets the wheel...no protrusion here:
<img src="http://pictureposter.audiworld.com/414/nospacer.jpg">

I know, the wheels are dirty....I'm working on a budget powder-coating program. Oh BTW, someone asked about the battery, so here's a pic of what you see when you lift up the trunk mat:
<img src="http://pictureposter.audiworld.com/414/battery.jpg">

Kevin B

No spare tire, huh? Not a surprise on such a lightweight machine...

Bob W.

i.e. air compressor and canister of goo. actually, just having the compressor would have been good enough for 90% of the flats I've had. Good enough to get me to a shop, that is.

NogaroHiro

<img src="http://i7.photobucket.com/albums/y298/nogarohiro/051029leftrearpad.jpg">

rear


<img src="http://i7.photobucket.com/albums/y298/nogarohiro/051030RFdisk.jpg">

front


<img src="http://pictureposter.audiworld.com/30545/tirewell-3.jpg">

TMS, tire mobility system

ELEVENS

In BMW parlance, we call that the liquid bubblegum dispenser.

Bob W.

...though it appears the B7 hub protrudes further away from the rotor.

ELEVENS

Definately it's 20.4 mm minimum thickness for the rotor, though.