Stringbike

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 Stringbike Kft., unveiled the bicycle in 2010 in Padova, Italy.[7]

Models

There are 2 main types of stringbikes. Stringbikes with carbon frame, and stringbikes with curved aluminum frame.

Stringbike models with aluminum frame:

  • A line Classic
  • A line Marine
  • A line Dragon
  • S line Stringie

Limited series stringbike models with aluminum frame:

  • D signers's Nanushka
  • D signers's Happarel
  • D signers's Spring Fashion
  • D signers's Black Pearl

Stringbike models with carbon frame:

  • E line RAAM (same model was used in the Race Across America 2012 - achieving 14th position overall)
  • E line Hurricane
  • E line Black Storm

Limited series stringbike models with carbon frame:

  • D signers's Alligator

References
  1. "Hungarian Stringbike Prototype Swaps Chain for Wires". Gizmodo.com. 2010-09-19. Retrieved 2010-09-24.
  2. "'Stringbike' wire replaces the bicycle chain". ETA. Retrieved 2010-09-24.
  3. Coldewey, Devin (2010-09-20). "Hungarian "Stringbike" Reinvents The Wheel". Crunchgear.com. Retrieved 2010-09-24.
  4. "String the next big thing in bikes".
  5. Boyle, Rebecca (2010-09-20). "Chainless Bicycle Uses Wire and Pulley System, Eliminating Grease and Increasing Cool Factor | Popular Science". Popsci.com. Retrieved 2010-09-24.
  6. "Introducing Stringbike: the bike with no chain (w/ Video)". Physorg.com. Retrieved 2010-09-24.
  7. Mark Brown (2010-09-20). "Hungarian designers debut Stringbike, a chain-free bike". Wired.co.uk. Retrieved 2010-09-24.


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