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Process for controlling gear shifting in a cycle, and corresponding systems and components

  • US 7,121,968 B2
  • Filed: 05/26/2005
  • Issued: 10/17/2006
  • Est. Priority Date: 03/29/2000
  • Status: Expired due to Term
First Claim
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1. A system for controlling when gear shifting occurs in the transmission of a cycle, the system comprising:

  • at least one sensor that detects a marker that rotates about an axis parallel to an axis coaxial with a rear hub of a cycle wheel, said marker having angular positions that correspond to no, forward, and rearward movement of a transmission chain;

    a control unit for activating said sensor according to a command request; and

    a shifter that shifts the chain, following the command request, only if the transmission chain moves forward.

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