Something to ponder while digesting your holiday goodies: how come this drivetrain never caught on? Apparently it is based on a design for a flying machine found in Leonardo DaVinci's notebooks!T he longer movement of the crank arms supposedly gives you more leverage. It's a Japanese bike but it's not like they're all over on the streets. In all my time here it's the first one that I've seen. Far more common, and cool in a totally different way, are all the old keirin bikes you see around the city. I talked to the dude in the bottom picture for a few minutes in Shibuya on December 23rd. He's a hair dresser. Good looking guy. But not as good looking as the bike!