Shifting Attention to Gear Shifters
As the name suggests, gear shifters are basically responsible for moving the derailleur or hub gearing to whatever gear you want to be in.
The way this works is by increasing or decreasing tension in the gear cable. By manipulating the tension, the gearing mechanism is adjusted.
Gear shifters can be found on an older bike frame’s down tube, or a more recent bike’s handlebars. For triathlon time trial bikes, the gear shifter is found at the end of the aerobars.
The gear shifter on the right controls the rear derailleur, whilst the gear shifter on the left controls the front derailleur.