Patent ID: 8600630

Claim:
An apparatus for determining and displaying gear ratios in a transmission system having a driving sprocket set, a driven sprocket set and a flexible drive member that engages the driving sprocket set and driven sprocket set, the apparatus comprising: a display; a sensing module, the sensing module comprising a plurality of magneto-resistive assemblies each comprising at least one magnetoresistive sensor and a magnet attached to a derailleur adjustment mechanism of the transmission system, wherein at least one of the plurality of magneto-resistive assemblies is configured to detect adjustment of the transmission system based on movement of the magnet relative to the at least one magnetoresistive sensor, the sensing module configured to generate a signal responsive to said adjustment of the transmission system; and a data processor communicatively coupled with the display and with the sensing module, the data processor configured to: receive the signal generated by the sensing module; process the signal to generate data relating to sprockets engaged by the flexible drive member; and write the data to the display.