Sensor-packin' bike wheel LEDs detect speed and light

Cyclists can already choose between plenty of cheap spoke-mounted LEDs that turn their bike wheels into highly-visible "rings of light" while they're turning. California-based startup MonkeyLectric has given the tech a new slant, though, with wheel lights that power up automatically – and only when needed. The result of a successful Kickstarter campaign, the new A15 Automatic Monkey Light consists of an LED module that is zip-tied to the spokes, along with a cylindrical battery unit that's likewise zip-tied to the wheel hub. An electrical cable, which is wound around one spoke, connects the two.