Pinion gearbox system ?

[robsc]

http://www.bikeradar.com/mtb/news/article/domahidy-designs-27-5-pinion-hardtail-46475/

 

Anybody care to explain this in layman terms . I see a chainring connected to a "sprocket" at the back . Surely one pedal revolution equates to so many millimeters of forward movement , how would the "gearbox" have any effect ? as it looks like the crankarms are connected directly to the chainwheel ?

[raptor-22]

Gearbox is between crank and rear hub

[Pure Savage]

http://www.bikeradar.com/mtb/news/article/domahidy-designs-27-5-pinion-hardtail-46475/

 

Anybody care to explain this in layman terms . I see a chainring connected to a "sprocket" at the back . Surely one pedal revolution equates to so many millimeters of forward movement , how would the "gearbox" have any effect ? as it looks like the crankarms are connected directly to the chainwheel ?

 

The cranks turn a shaft inside gearbox and inside chainring, then a shaft turns the outside chainring. 

[Josh0]

The input shaft (crank spindle) rotates within a hollow output shaft that rotates the chainring. So they rotate independently of each other. 

 

See here, just scroll down.

http://pinion.eu/en/products/technology/

Very clever!

[NickGM]

http://www.bikeradar.com/mtb/news/article/domahidy-designs-27-5-pinion-hardtail-46475/

 

Anybody care to explain this in layman terms . I see a chainring connected to a "sprocket" at the back . Surely one pedal revolution equates to so many millimeters of forward movement , how would the "gearbox" have any effect ? as it looks like the crankarms are connected directly to the chainwheel ?

One pedal revolution on a regular bike equates to one rotation of the (front) chainring because they rotate as one. But in this case a one pedal revolution does NOT necessarily equal one (front) chainring revolution - because there is a gearing system in the bottom bracket. I've only skim-read but it appears to be directly coupled with the pedals. So one pedal revolution could, say, result in the front chainring rotating twice. And twice for the rear too if those 2 rings are the same. 

 

It's very hard to not call this revolutionary. Or out of the box. Let's call it a potential game-changer. 

[PregoRoll]

Similar idea to what Greg Minnaar had on his Honda way back in the day?

[IH8MUD]

Now take that thing and fit a Rohloff speedhub at the back.   

 

The one hand controls the front gearbox and the other the back gearbox.

18 gear options front

http://14761-presscdn-0-15.pagely.netdna-cdn.com/wp-content/uploads/2014/08/Eurobike_Pinion_2015_KlausKneist__KKM8117-780x520.jpg

 

 

 

and 14 gear options at the back.  

 

http://www.cyclingabout.com/wp-content/uploads/2011/11/Rohloff-Exploded.jpg

 

 

 

 

 

It could be either totally cool or " deurmekaar soos k*ts in a tuimeldroer." 

[robsc]

Thanks everybody . I see on close inspection that the crank and chainwheel are on 2 different spindles , makes perfect sense now 

[Gravity]

love this

[RockCoach]

It's been around for a while already. Just not in SA. Nicolai makes pinion specific frames. Although exdpensive you basically are buying your groupset and frame together.

 

Here is a list of other manufacturers who make pinion geared bikes:

http://pinion.eu/testdev/en/discover-pinion/bicycle-frame-manufacturers/

(some don't seem to exist anymore)

[robsc]

I wonder how much torque/wattage is lost in the gearbox . Would be interesting to see a measurement at pedal and then at chainwheel ?

[BDF]

Now imagine how this could interact with the motor on Femke's Willier!

[Martin PJ]

I wonder how much torque/wattage is lost in the gearbox . Would be interesting to see a measurement at pedal and then at chainwheel ?

 

The current design that we all use will persist because it is so efficient. Even if this loses as little as 10 W, then riders will not want to race it. Like riding with the brake pads touching, it doesn't loose many watts but you still feel it.

[Hairy]

great for commuting bikes .... .just too expensive for a commuter bike

great for a touring bike going out into no mans land for long periods of time ... might just be "safer" then using a chain vs belt drive.

the time of the internal gear drive bike will still certainly come.....when, not sure.

[droo]

Now take that thing and fit a Rohloff speedhub at the back.   

 

The one hand controls the front gearbox and the other the back gearbox.

18 gear options front

http://14761-presscdn-0-15.pagely.netdna-cdn.com/wp-content/uploads/2014/08/Eurobike_Pinion_2015_KlausKneist__KKM8117-780x520.jpg

 

 

 

and 14 gear options at the back.  

 

http://www.cyclingabout.com/wp-content/uploads/2011/11/Rohloff-Exploded.jpg

 

 

 

 

 

It could be either totally cool or " deurmekaar soos k*ts in a tuimeldroer." 

 

So you'll be able to ride at anywhere from 1km/h to 160 at the same cadence, but you'll need a forklift to pick your bike up. Your last sentence pretty much sums it up.