Hydraulic gears ?

[Slowroller]

The main issue with most if not all current gearbox systems, either bb or hub mounted, is that you cant change gear under load. Irrelevant of the motor, the moment someone comes up with a relatively lightweight BB base gearbox that can shift under load, and doesn't rely on a grip shift type shifter, it will change the MTB industry overnight.

The Mubea uses this gear box, shifts under load, coasting or stopped and can use a SRAM trigger shifter.

Effigear⎮Bicycle Gearbox⎪Boîte de vitesses vélo⎪France | LA BOÎTE En

 

[R120]

The Mubea uses this gear box, shifts under load, coasting or stopped and can use a SRAM trigger shifter.

Effigear⎮Bicycle Gearbox⎪Boîte de vitesses vélo⎪France | LA BOÎTE En

Very interesting

 

[Carlos Muralhas]

The main issue with most if not all current gearbox systems, either bb or hub mounted, is that you cant change gear under load.

Not true with any solution based on continuously variable planetary (CVP) gearboxes - like the NuVinci 380 for instance.
Continental presented an eBike motor on Eurobike with an internal NuVinci gearbox that does manual or automatic gearing. Too bad it's so heavy...

First ride: Continental 48V mid motor system with automatic gearing

 

[ccrdave]

there used to be a car, a DAF i think that had an auto box based on a sliding belt as the car went faster the belt slid to the narrower side on a drive which was cone-shaped no gear changes just seamless drive action. I wonder if that could be implemented in an e bike

 

[Carlos Muralhas]

there used to be a car, a DAF i think that had an auto box based on a sliding belt as the car went faster the belt slid to the narrower side on a drive which was cone-shaped no gear changes just seamless drive action. I wonder if that could be implemented in an e bike

Functionaly that's exactly what a continuously variable planetary (CVP) gearbox does. Continental just presented an eBike motor with an internal continuously variable planetary (CVP) gearbox (see previous post).

 

[R120]

Not true with any solution based on continuously variable planetary (CVP) gearboxes - like the NuVinci 380 for instance.
Continental presented an eBike motor on Eurobike with an internal NuVinci gearbox that does manual or automatic gearing. Too bad it's so heavy...

First ride: Continental 48V mid motor system with automatic gearing

Yes we already discussed that earlier in thread, but a CVP is a different concept to manual gears

 

[Carlos Muralhas]

Yes we already discussed that earlier in thread, but a CVP is a different concept to manual gears

It's gears nonetheless, from easy to hard gear (with a 380% variation in the case of NuVinci 380). We don't really need gear 1, gear 2, etc, we need gering from easy climbing gears to high speed gears. If they are continuosly variable is even better, you can ALWAYS be in the right gear for the situation and they shift easily during load.

 

[R120]

My experience of CVP/CVT in cars and motorbikes is that the gear the gearbox thinks you need is quite often not the one you want! If it can be made to work, brilliant.

 

[Blackbird]

Nuvinci is a manualy adjusted cvt. So that should not be a problem.

 

[urastus]

We need to get the derallier hanging gubbins higher up away from the ground .
Silly question ..could the mechanism be mounted above the cassett? Must have alook in the morning.
Trouble with EMTB development is I now want another bike.......

Yes! Just need to pedal backwards . Although, that presents another problem..., well at least a couple of problems...Silly idea.

 

[OldBean]

My erotic dream has arrived ....just needs full suss......Gimmi Gimmi Gimmi

 

[speedkills]

The Mubea uses this gear box, shifts under load, coasting or stopped and can use a SRAM trigger shifter.

Effigear⎮Bicycle Gearbox⎪Boîte de vitesses vélo⎪France | LA BOÎTE En

This looks like a motorcycle gearbox to me, which seems a good place to start. I wonder if they'll get off of the ground? Having owned an alfine and a rohloff I'm not a fan of the planetary gear based solutions in their current form so always keeping my eyes open for something better.