The failing weather reminds us we're fast approaching the end of another year, but Zero Motorcycles wants to brighten our day with the announcement of its 2013 all-electric line-up. Immediately noticeable are the harder lines and healthy dose of matt black on the frames of the Zero S, DS, XU and MX refreshes. New to the team is the FX "Stealth Fighter" (pictured above), touting the fastest accelera