The gravity speed bike.

With a locked crank arm, no drivetrain and a metal seat that looks about as comfortable as this bike is strong, the Gravity Speed Bike is not for the faint of heart. Or the average commuter. Or anyone who enjoys creature comforts like pedals or brakes. No, Jeff Tiedeken’s new downhill bike is for those who just want to get somewhere really, really fast. We’re talking 60 mph fast, which Tiedeken reportedly clocked himself.

Bike builders and enthusiasts will appreciate details like the floating locked crank arm that acts as a rear foot peg (i.e. no foot pedal) and sweeping arc of the frame. But this is just Tiedeken’s first effort. For the second version he plans to add a headlight and an iPhone holder – so you can text your friends that you’ll be meeting them in .7 seconds flat.

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