The 636 my girlfriend bought came with this cage on it. I removed it since it would've probably scraped once we lower it for her. We don't really care too much for it but could really use the extra cash to buy her a new set of tires.
$200 O.B.O.
Here's some pics of the cage on the bike so you can get a feel for the dimensions.
BTW, I also have a front rim for the same bike. Gunmetal color. I bought this rim for her bike but we recently bought yet another one that is waiting to be mounted on her new tires. So, the one currently on the bike is for sale. It's pretty rashed on the lip and I've had to hammer it a bit because it wasn't holding air. Finally got it working and holds air just fine. But like I said, it's a lil ugly. Rim will come with a used Dunlop Qualifier 120/70 tire and both front rotors. Make an offer.