Yet their bikes remain small-form-factor machines physically
I really like the size of the zeros ATM
It's a fine form factor for what it is and I don't think they should abandon it; I think they need two.
BUT we're talking about a frame with serious size and ergonomic limitations:
- You can't glance at the dash while keeping an eye on traffic.
- Windscreens that are adequate on other bikes direct air into your chest on a Zero because the cockpit is so short.
- It has serious support anchor limitations when it comes to building a cockpit, mounting fairings, or carrying luggage. Examples: the steering head has a VIN plate on it, the shoulder of the frame is too smooth to anchor onto, the upper bolt holes for the crash bars are merely M5, and then the tail section assembly is sort of a bolt-on affair that can easily get degraded over time.
Even the way Terry mounted his Vetter fairing on the 2012S doesn't work as well on 2013 models.
Anyway, the powertrain is capable of handling much more load than the frame is rated for, and the frame isn't shaped to grow.
I understand the reasons why, but it's worth pointing out that there are bikes classified as lightweight or even middleweight touring vehicles with the same powertrain performance (aside from wheelies): the V-Strom, BMW F650GS, and Kawasaki Versys, say.