How do you think bike are called on Alternia ? Two-wheel-device might be mistaken with a motorbike, so maybe foot-powered-two-wheel-device ??

It’s a Two Wheel Device, because both Kanaya and Porrim have been called the Village Two-Wheel Devices, referring to them being the ‘Town Bicycle’, Kanaya with Auspisticism, and Porrim with Redrom relationships (And perhaps Blackrom as well? Can’t quite remember).