this post was submitted on 29 Sep 2023
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Stringbike: Chainless Bicycle Design (infogalactic.com)
submitted 1 year ago by [email protected] to c/[email protected]
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The Stringbike is a bicycle that uses a rope and pulley drive system instead of a traditional bicycle chain and sprockets.[1][2][3][4] It uses two Dyneema ropes attached to pulleys attached to swinging lever and cam mechanisms, one on each side of the bike. These mechanisms replace the round sprockets found on chain-driven bikes. Unlike some traditional 10-speed gears using a derailleur, there is no slippage when changing gear ratios.[5] The Stringbike uses a 19 gear ratio system with no duplicates and a total gear range of 3.5 to 1. The transmission ratio can be changed with a shifting knob located on the right-side handle grip. Gear ratios can be changed even when the bicycle is almost stationary.[6]

Hungarian designers from the manufacturing company Schwinn Csepel Zrt, unveiled the bicycle in 2010 in Padova, Italy.[7]

It never caught on so possibly isn't better than a chain design, but maybe it simply lacks popularity or the idea might be made use of for some other application

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[–] [email protected] 2 points 1 year ago (1 children)

Interesting concept, although it seems like one of the biggest "why though?" projects ever. Very interesting idea, but probably overengineered and expensive.

[–] [email protected] 1 points 1 year ago

Seems like the only benefit is you don’t have to slow your pedaling when changing gears?

A CVT seems like a better alternative though, and has been done before. They’re just heavy and expensive for bikes. https://en.m.wikipedia.org/wiki/NuVinci_continuously_variable_transmission