Also claimed to save 17watts over other gravel bikes via it’s aero design.
I really don’t see the point with di2 having automatic front shifting. But the 17 watts of aero saving is interesting
That looks like a lighter internal gearing system than the Shimano patents.
Interesting to see where they go with this tech. Could be appealing from a maintenance and robustness standpoint.
From the 2nd link in the OP:
“The brand also believes its system is more efficient overall than a conventional 1× setup because it reduces the amount of cross-chaining.”
Er - why? You won’t use the entire cassette? Also - a planetary gear reduction system (I assume one gear is fixed, the second one is a reducer) does have losses, and not small one, so whatever gains would come from “less cross-chaining” would largely be offset by the losses when using the reducer.
Confirmed from Classified’s web site - one gear is direct-drive, no loss, the other a 0.7 reducer.
It’s 2-speed only.
I should have looked deeper. I’m at work and only browsing, sorry.
I think they picked the wrong ratio, as they could have improved on the usable range compared to a front derailleur by having more of a reduction. I think a 0.5 (or even lower) reduction would have been more interesting, you could get a really wide range, with also fairly close gear spacing.
I think the only real downside to a larger difference would be shifting the ‘front’ would be more disruptive, and would require more rear shifts. This could be largely handled by an all electronic drive train.
Because front derailurs are miserable.
They’re not that bad on a road bike. Pain in the a$$ on a mountain bike.
Yeah I’ve never thought they were bad on a roadie.
It is not meant to be a hub gear, but replace a front derailleur with two chain rings. And at least gearing-wise, it seems to do exactly that.
They are bad also on a road bike. In two races last year my chain seized at 60+ km/h. Fortunately, I was able to get it unstuck after a few seconds, but kinda disconcerting when you have to deal with a technical problem on a technical descent in the rain.
I can see a clear future in this. The only problem are the big boys (shimano, sram, campa,…). If it is a game changer they will either buy them or develop something similar if they haven’t already.
Anyway looking forward to test this…
Just to be clear - apart from the wireless shifting part, there’s nothing earth-shattering about an in-hub planetary gear mechanism. The Sturmey-Archer 3-speed hubs from the 60’ used the same mechanical concept. Rohloff has pushed the concept to 14-speed, while still using cable-driven shifting.
Shimano has internal gearing hubs since years. The Alfine and Nexus lines have 8-speed hubs, including disc brake (and even coaster brake) versions.
SRAM 3-speed hub with cassette. They dropped that product.
Thx for the info! I should have known this, my children’s bikes have those inner gearings.
There’s a fascinating article by John Allen on Sheldon Brown’s web site on the topic. Well worth reading for the mechanically-enclined.
You can’t really go further than 2:1 on a single-stage planetary gear reduction. The efficiency and manufacturability drop as you increase the ratio.
I think it can be a huge improvement in MTB and cyclocross… The front mech always catches a lot of dirt/mud. Also the shifting under heavy load can be an advantage.