Detangler

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.

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.

The inner cables connect to metal tabs on a disc attached to the upper side of a thrust bearing placed around the stem or steer tube.

Squeezing the brake lever pulls the inner cables and causes the bearing assembly to rise.

The cables are split in this way to ensure that the detangler mechanism moves equally on both sides.