Before attempting any "G CO CRD" run, the crew leader must activate the correct :

Let’s break it down.

A proper transforms your bike from a collection of parts into a unified machine that responds to your pedal stroke like an extension of your legs. Take the time to dial in each letter – because on race day, the rider who shifts fastest, climbs smoothest, and wastes zero watts on drivetrain friction is the one crossing the line first.