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,
I am currently working on a 20'' quad design with front drive, similar to David Bruce's trike:
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,
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