| 1. | A direct drive system , used on track bikes , in which the chain ring and rear cog are linked , so that the pedals turn constantly while the bicycle is moving , and coasting isn ' t possible
固定飞轮，或称“死飞” ，飞轮与后轮轴皮连为一体，脚踏转动与后轮转动完全同步，无法实现一般棘轮飞轮自行车的脚踏不动时的滑动。 |
