No documentation that I know of but several guys ran them at worlds this past year. Most of the HTC-columbia guys and Zirbel. Call HED they can probably verify it for you. I guess since it is bonded to the rim it does technically add some “structure” to the wheel.
Thank you very much! I’ll give Hed a call tomorrow, too. Odd that a cover that’s bonded is legal.
Wonder if one of the old J-discs would be considered legal, as their covers were bonded, too 
You should have no problem… unless you approach to the commissair just before the start and ask him if he considers that the cover is a fairing, and if it is OK to race with that particular wheel. I would call or e-mail USA Cycling before the race, just in case.
The word “cover” (or anything in that regard) is not found in the UCI rulebook in reference to a wheel. As a matter of fact you won’t even find the word disc in the UCI rules in reference to a wheel. Discs wheels are also not mentioned neither in the UCI “Non-standard Wheels in Conformity with Article 1.3.018” document, nor in the UCI’s “Technical Regulations for Bicycles” guide.
A direct reference to (wheel) covers is only found in the International Triathlon Union (ITU) rule book, not in USA Cycling, nor**** in the UCI rulebook.
**ITU competition rules/**G.3.2 Legal Equipment/ f) No wheel may contain mechanisms which are capable of accelerating it. Disc wheels and rear wheel covers are permitted. However this provision may be changed by the TD in the interest of safety; (i.e. High wind) USA Cycling rulebook/1M. Bicycles 1M1./ Bicycles used in competition must be propelled solely by the rider’s legs and shall have the following characteristics: /(c) Wheels may be made with spokes or solid construction. No wheel may contain special mechanisms to store and release energy
Recently there was a USA cycling rule change in reference to Collegiate events, where only UCI mass-start legal equipment should be used. This means that no aero equipment should be used in collegiate TT races (this includes aerobars and disc wheels of course). USA Cycling also makes it clear that disc wheels can not be used in a Gran Fondo race (but makes no direct reference to road races). Besides that I have not been able to find any other reference to disc wheels and particularly to wheel covers.
There are some things that you can do under USA Cycling rules, and that you can’t do under UCI rules and viceversa. I once saw a photo of someone that looked like Arnie Baker breaking away on a road race wearing an aero helmet (an LG Rocket if memory serves me right). I asked him if it was him, and he confirmed this. He would have never been able to race with that helmet on a UCI sanctioned event.
If anyone else has different information regarding the rules and disc covers please share.
Sergio
the Latest Velonews buyers guide stated that it was UCI legal because the bonded cover Hed uses is a structural component.