Back in January 2025, Yamaha showed off a new concept line of EVs that it was bringing to the masses attending Tokyo Auto Salon 2025. At the time, I was admittedly quite preoccupied with a little quad meant to channel design inspiration from the Kenny Roberts two-stroke racing era, and how it bore a slight resemblance to a model train. And also, this little cyberpod-esque thing.
I regret to inform you that I neglected to mention something very important when I wrote that up. Something that I overlooked at the time, but that I'm about to rectify right now.
See, Yamaha decided to call its entire modular EV line by the name "Diapason." If you speak French or Italian, you already know why that's funny and/or clever, depending on your point of view. What's Yamaha's logo? Tuning forks. Besides its association with pipe organs, what does the word 'diapason' mean in both Italian and French? You guessed it: Tuning fork. Well played, Team Blue. Well played, just like that pipe organ or any of those many musical instruments made by a completely different branch of the company.
Why are we talking about this now? Because Yamaha just showed off a little demo unit of the C580 model in its Diapason lineup, which you can see in this video.
By now, you're probably familiar with kei trucks, and how they're simple, unassuming, basic transportation that's also adorable. They're low-speed, meant for a specific workhorse purpose, and that's it.
And that's what the Diapason C580 Concept appears to be about, as well. It's a little two-seater EV UTV, meant to haul oranges or push snow away or just transport a couple of people somewhere. But it's so cute!
Gallery: Yamaha Diapason C580 Concept
Like the other concepts in the Diapason lineup, it's powered by the Honda Mobile Power Pack e:, which is very much a power system that already exists. So while the Diapason C580 is still a concept, does that mean we can expect that it, too, might someday soon be a production vehicle?
I mean, Honda's already demonstrated how its HMPPe: could power things like construction equipment and tourist boats. So why not? There's been no official announcement yet about the C580 becoming anything more than a concept, but the fact that this video was just released at the beginning of May 2025 clearly means that someone is still thinking about the C580.
To be clear, only part of the video shows an actual demonstrator video. Toward the middle of the video, there are short clips of clearly labeled AI-generated animations of a C580 concept in various work scenarios. Then, afterward, it goes back to clips of people who might find a C580 useful, particularly if it was to become a real vehicle that could do the things shown in the AI renders.
Will it ever happen? Maybe. Will it ever be released outside Japan? That's unclear, but we can certainly hope.
