Just been involved in a discussion with colleagues about updating the entry in our house style guide for bicycles/bikes.
We currently say:
Do not use, refer to cycles - this is more inclusive for different types of cycle
But some people think "cycles" sounds too stiffly formal and unnatural, which I agree with, and there are contexts where you don't need to be inclusive, ie you're talking specifically about bikes, so we're modifying it to allow people to say bikes when they mean bikes.
M'colleague also suggested adding a qualifier to explain what we mean by "different types of cycle", viz:
Do not use, refer to cycles - this is more inclusive for different types of cycle (monocycles, bicycles, handcycles etc).
"Monocycles" made me wince. I presume this is the term that has been adopted to describe those motorised single-wheelers to distinguish them from pedal-powered unicycles. Ugh. I suggested leaving that out - they're a bit of an outlier and not really "cycles" in this sense - and mentioning tricycles instead.
M'colleague also said she thought about including tandems but I pointed out that most tandems are bikes. This got me thinking, though - is there such a thing as a tandem unicycle?
<google>
Of course there is!
https://road.cc/content/blog/12044-tandem-unicycle-positively-unbalanced