Mounting high of rear derailleur

Joined
Jan 5, 2023
Messages
3
Location
Vienna, Austria
Hi,

I am currently working on a 20'' quad design with front drive, similar to David Bruce's trike:
My main challenge is the positioning of the front derailleur: the derailleur has a maximum height (distance between lowest point of the cassette and the lowest point of the derailleur) of approximately 15cm (5.9 inch) which results in a distance to ground of only ~5cm (1.9 inch). This distance should be at least 10cm.

Some (especially hand bikes) use an inverse design (e.g., https://www.faz.net/aktuell/sport/mehr-sport/handbiker-vico-merklein-die-geballte-kraft-der-kurbel-12718032.html) but with this the position of the front wheels is very close to the bike's nose resulting in big turning circles.

Some constructions redirect the chain (e.g., https://www.performercycles.com/recumbent-bikes/folding-recumbent-front-wheel-drive). But for this the driver's position is also moving up. But the driver should stay as close as possible to the ground (low rider).

Has anyone an idea how to mount the derailleur so that the distance to the ground gets bigger?

Regards,
 
Last edited:
Joined
Feb 7, 2008
Messages
4,572
Location
Nottinghamshire England
Hi there

Another quad being built great.

You have very little space there , it is going to be challenging , do you plan on the suspension as well ?

Could something like this help ?


Could you fit a IGH hub under the chain rings before the drive shafts ?

Most quads are not ' low rider ' why do you want to be low ? and what do you mean by low ?

My first Python was 5" frame height off the ground and 8" seat height , it was very wet and dirty down there !

Paul
 
Joined
Oct 19, 2012
Messages
2,384
Location
Wakefield, UK


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