Hey Trikester,
Thanks for the reply and information.
The FX looks like a great ride and would be my first choice for a new Zero without regard for price. It is a Dual Sport bike, like the DS, and is made street legal and that tends to work out for most buyers that most of the miles end up being on the street and for that reason I can agree that belt drive would be better for most users. If I were buying a new FX I would want belt final drive and if I were a Zero Motorcycle engineer I would have put the belt final drive on the FX model with the chain option for those who want/demand it, just as they did.
The MX model which is pure dirt bike comes with a chain final drive.
The nice thing about Zero bikes is that they make it very easy to put on a chain drive if you so desire it and the cost is nominal as well.
As mentioned in my other post, I spent a considerable amount of time on Buells and the Ulysses model, also a dual sport, came with belt drive that was not easy at all to convert to chain drive and this was a source of considerable consternation to a small percentage of Buell riders.
Every ride for me starts and ends with a few miles of dirt road and the Buell belt system survived it just fine as well as some rides on trails and fire roads. Overall, for a dual sport bike that is 80% road miles, I still like the belt for it's clean, silent, low maintenance nature. I think it fits the nature of an electric motorcycle perfectly.
I just wanted to know if there were some Zero DS riders here who have put some dirt / gravel / sand miles on a DS with belt drive and what their experience is with belt longevity or in field replacement if the worst thing happens.