RE: anything special about a front wheel drive wheelset?
Here is a response to a query I made to ENVE:
Thanks for reaching out. Unfortunately we don't recommend our product to be used in that application. Understand that if you do use our wheels it is not covered under any type of warranty. Our rear wheels are designed to be in the rear and undergo different wind pressures so it would not be the most optimized option in aero dynamics either. Apologies for the inconvenience.
Best,
Clay Ahlf
Consumer Experience
The reason I asked is because the shape of the ENVE wheels are different front to back. The "front" rim is shallower and more rounded to better shed the crosswind whereas the "rear" wheel is deeper, but more pointed where they expect the air to have gone through already the frame of the bike. So, the ENVE rear wheel isn't really designed to work as a front wheel on the Vendetta and the spoke count is too low to make their front rim work.
RE: what do you recommend?
There are too many factors to say *this* is the correct wheelset. If you assume that the ground is completely flat and that there is zero wind on a closed course, then a full disc front and back is fastest. If there is some wind, you are not going to want a full disc in front. I ran 80mm in front and I would go higher if it was an improvement because I am heavy enough that the wind doesn't give me much bother (even B girl runs 80mm up front without issue). If there is wind and you are skinny, then, that configuration might still be too much and you might get to the point that even the disc in back needs to be a deep dish instead. Now, if it's not completely flat, you need to start considering weight and as the grade increases, eventually, you'll tip in favor of an ultra light climbing wheel. Of course, it takes an extremely steep grade before the lighter wheel gets the advantage so, even on a course with a lot of climbing, you're probably going to win with something like zipp 303's vs. going crazy about weight. Wheels are huge though - the bike will feel completely different depending on your selection so, choose what works based on the course, the wind, and your own weight.