The detangler, Gyro or rotor[1] is an invention for the freestyle BMX bicycle, allowing the handlebars to turn a complete 360° rotation without the brake cables getting tangled up.[2] A detangler is usually only used for the rear brake cable. The front brake cable can be routed through the stem, via a hollow stem bolt known as a Pott's mod bolt,[3] and fork steer tube to avoid the tangling problem.