Warning, this post is completely irrelevant but kinda fun. I've ridden more than a few organized rides on my fix gear (1/8 chain and sprockets). Flip-flop wheel and often carry a third (tiny) cog and chainwhip. (You can see both on my logo.)
When I encounter tandems and can ride side-by-side with them (that's not often!) I point out that my bike and rider are a half tandem bike and team. My bike is the front wheel and cockpit of the tandem and stoker seat tube back. None of all that derailleurs, cogs. Just a timing chain. Now when it comes to the team, my half team is captain waist up, stoker waist down. Captain picks the route and line on the road, chooses the gear (this captain is a little odd - he only shifts at a standstill and absolutely refuses to coast). Stoke does all the work.
Tandem captains are usually not impressed by my analogy but the stokers get it.