hubless

/ˈhʌblɪs/ 6
lacking a hub, or having one or more wheels without a hub.

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.

hubless

-less ⌜ 表示缺乏或没有某种特性 - indicating the absence or lack of a particular quality ~ ⌟
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