Wheel cover - Which wheel?

I am not an expert but if you have race wheels I would install it on them. 

BTW, I have considered ordering one of these also just curious how much they charged for shipping?  I know the covers are around $60 but did no see anything about shipping other than it might be alot.

Thanks

I don't think you do have an option.  Unless you specified for them to trim the cover to fit your Carbone, you are going to have to use it on the Shimano.  Otherwise there will be no way to screw the two sides together because the rim's deep section will be in the way.

If you race with the Mavic Carbone then I would get the disc cover for that. I have mine on a Jet 90.

you can see it here: http://www.beginnertriathlete.com/discussion/photos/show-album.asp?albumid=6845&photoid=48926

edit to add: if you already ordered you might not have other option but to use it on a regular wheel unless you requested to have it trim to fit the carbones

Are you going to leave it on permanently?  If so I might actually pick the r500.   The disc cover will be providing all the race quilities of that wheel, and if there is ever a time you wanna go on some epic road ride, you aren't going to want the disc on are you?  I'd use the least aero/light wheel cause you are going to add your own aero and teh cover is going make it a heavy wheel regardless. 

I assumed you use the carbones everyday.  (I would want to if I had them)

I kinda agree with nelg, you got a nice lightweight race wheel and you are going to turn it into a heavy disc.  Kinda defeats the purpose of a disc cover because you'll likely have $500 into that wheel now.     Maybe you oughta look for a mavic open pro rear wheel with a nice hub.   I've heard the covers work great on those. 

I think aero does trump weight, but that is if you are talking flat rim vs disc wheel.  Your carbones are already quite aero AND light, so that is great combo.   Not sure how much more benefit going to full disc over deep dish is going to be.  Will be interesting to see how it performs for you.   

I didn't get much sleep so sorry if I am not making any sense. I was just trying to say that it will probably perform almost the same no matter which wheel you use it on, so why not put it on the cheapest wheel to get the most "bang for the buck".  You are basically going to cover up  the aero rim and spokes you paid big bucks for on the mavic.  

A few thoughts:

The covers are NOT difficult to take off.  I do it all the time.  All it requires is removing the cassette and undoing (or tightening) some screws to hold the cover together.  It's a 5-10 minute job.  Every once in awhile I take advantage of the cassette being off and give it an extra good cleaning--add another 5-10 minutes.

The windy days are the days you REALLY want the disc.  That's when it shines.

Since the carbones are already aero, the advantage of the disc is less than going from a standard wheel.  But it is still faster--no matter any weight penalty--on virtually any tri course.  And the windier it is, the greater the advanatge in all likelihood.

From the sound of things, I'd cut it for the Carbone.

A disc is faster in most conditions, IIRC the carbone wheels are only 40 mm deep hence why not convert your real wheel into a disc in particular since those are the racing wheels? unlesss you want a disc for training which sort of defeats the benefits you'll get on race day.