hubless

adjective [原级]无轮毂的；无中枢刀片的

I've seen a handful of hubless concept bikes but the Synapse bike goes one further with integrated electric motors to assist the rider.
我以前见过一些无轮毂概念自行车，但是这款突触自行车更进了一步，它集成电机从而是一台电动自行车。