You buy one. There are so many special parts involved that building one out of generic parts is pretty much impossible.
The unicycle became infertile
unicycle riding ultralight aviation unicycle basketball unicycle hockey
the clown rode the unicycle down the street
1 wheel on a unicycle
That is the correct spelling of "unicycle" (one-wheeled vehicle).
Ichirinsha [一輪車] is unicycle.
She was able to ride the unicycle very well.
A onewheeler or monocycle. Those both are synonyms for unicycle.
It is an electric unicycle manufacturer, a best seller of electric unicycle.
depends what unicycle
Balancing on the single wheel of a unicycle is difficult to master.
english, I think uni=1 and cycle= circular movement so it a unicycle