It sounds great. Someone neutral may want to dive into the efficiency of the system.

i am sorry to break it to you the hub has been in existen for a couple of years now its just now its being added by enve

if you search youtube there are already reports on efficiency of it (check peaktorque)

Yeah this is old and not an enve product. Already in use by some Parcours athletes in tri races, I think.

Clickbait thread title: one might think the OP @Rocky M has been under a rock since last year.
Enve: https://enve.com/...ions/classified-hubs

Hambini offers a technical analysis last year (key takeaway: theoretically inefficient in the shorter gear lengths):
https://www.hambini.com/...m-technical-details/
"The net result is an efficiency of around 96% (optimistic guess for the classified hub) and a total deficit of 4% vs a 2X conventional setup in low gears (93.1% vs 97%). Many people familiar with epicyclic gearboxes think that is an optimistic amount and suggest the efficiency of the gearbox alone would be around 90%. That would equate to a 2X drivetrain at around 97% efficiency and the classified system at around 87% system efficiency."
Other aspects worth noting are: bearings in hub cannot be replaced (return to Classified), and bespoke (expensive) cassettes.
https://www.researchgate.net/publication/226757576_Theoretical_and_Experimental_Efficiency_Analysis_of_Multi-Degrees-of-Freedom_Epicyclic_Gear_Trains Roymech https://roymech.org/Useful_Tables/Drive/Gear_Efficiency.html

In fairness, Hambini never actually saw or tested a hub. It was all pure conjecture on his part. Whereas Peak Torque (who seems like an all-round more measured individual!) actually tested the system & came up with numbers far closer to Classified's published claims:

Part 1: https://www.youtube.com/watch?v=rPVG2RA97Pg
Part 2: https://www.youtube.com/watch?v=wU6S01uITB8

I saw the system at a bike show last year & was quite impressed by how it felt. That was only on a turbo trainer but it could handle the measly handful of watts I could put through it.

I know Ruth Astle is sponsored by them & think Kyle Smith was riding it last year too. It would be interested to know how they have found it and whether it has helped their racing.

I think there was already a long thread about these hubs. IIRC the takeaway was that the hub is fixed in the big ring equivalent, so no efficiency losses expected, but the internal system is probably less efficient than all but the most extreme crosschains. You still have ~half of the cross chain losses in a 1x system and that is compounded by the little ring equivalent losses in the hub. These losses being offset by improved aero from no front mech is unlikely.

I'm sure the hub can handle any amount of watts you put through it, that's not the issue. It's the imperceptible loss of efficiency. Put two empty water bottles on your bike and it'll still ride perfectly fine, you won't notice any difference, but you'll go a little bit slower.

Also no word on long term wear of those tiny little gears.

Previous thread: https://forum.slowtwitch.com/...ified%20hub#p8016031