The Jetbikes of the Eldar are designed for extreme manoeuvrability, able to turn on the spot and rapidly accelerate or decelerate. This enables the rider to make swift hit-and-run attacks, emerging from cover to attack before slipping away again. An Eldar jetbike uses all the rules for jetbikes given in Warhammer 40,000. In addition, a model on an Eldar Jetbike which is not falling back may always move 6" in the assault phase, whether they are within 6" of an enemy or not. This move can be made in any direction, it does not have to be a charge towards the enemy, even if the model is within 6" of an opposing model.
Eldar Jetbike
Source: Codex: Harlequins, p. 11