This is the TriRig product: https://tririg.com/...cts/delta-aero-cover

There are other bikes that have this type of brake cover as part of the original design though. Most notably several (all except the newest?) versions of the Trek Speed Concept.

Thanks for sharing! That also looks very similar to the old speedmax or felt (and others ofc) that covered the rim brakes like that. Wow, what a tricky call to make if that is illegal or not.

I was just about to buy a delta cover. Rule 5.03 seems to take direct aim at tririg.

Wheel covers are also explicitly defined in the 2024 competition rules as being allowed: "section 5.02 EQUIPMENT (a) Wheels (i) The front wheel must be of spoke construction (aero rim with spokes is permitted) and must not be solid; (DSQ) (ii) The rear wheel may be either spoke or solid construction (disc wheel). Wheel covers are permitted only on the rear wheel. For reasons of safety, solid (disc) rear wheels are prohibited at the IRONMAN World Championship"

5.03 (b):
2023 Language: Fairings are prohibited. Any device added or blended into the structure
that may decrease, or that has the eƯect of decreasing, resistance to air penetration, or
that may artificially accelerate propulsion, such as a protective screen, fuselage form
fairing or the like, is prohibited; (DSQ)
2024 Language: Protective screens, fuselages, fairings, or any other devices or materials
(including duct tape) added or blended into the structure with the intent to reduce (or
having the eƯect of reducing) resistance to air penetration are prohibited. Aerodynamic
assemblies and protuberances on the head tube or elsewhere are prohibited. Provided that
the use of adhesive tape (including duct tape) does not fundamentally alter or enlarge the
general shape of the structure, adhesive tape may be aƯixed to the bike (e.g., to cover valve
cutout of the rear disc wheel, to cover bolts access, etc.); (DSQ)
Reason for change: No penalty change. Rule amended to be consistent with existing
World Triathlon rules. Additional verbiage added to provide further clarity around use of
adhesive tape.
For Reference, World Triathlon rule states: “Fairings are prohibited. Any device, added or
blended into the structure, that is destined to decrease, or which has the eƯect of
decreasing, resistance to air penetration or artificially to accelerate propulsion, such as a
protective screen, fuselage form fairing or the like, shall be prohibited

You'd have to roll it out over many years. Too many non-UCI bikes in use at the moment.

It's also not in the interest of IM to go to UCI rules. People finding out you can do a TT for $40 is a net negative to their $1000 TTs.

I have read this thread and may have missed it but does this prohibit aerojacket disc covers?

No

Didn't realize Felt and Canyon had these, but Dimond and Cube also used a cover in this fashion. You could almost claim conspiracy to force people holding their rim brake bikes to upgrade to disc if all these covers are suddenly illegal.

I've asked for a thumbs up or down from Jimmy R on the delta cover. Will keep this thread posted.