We're all familiar with internally geared hubs... from those three-speed Sturmey Archer hubs that are so ubiquitous to the ultra high-tech Rohloff 14-speed and Shimano Alfine 11-speed. But, how many people are familiar with the internally geared cranks? Even a good fifteen years after we produced our first Schlumpf PBW folding bikes, the Schlumpf has still not gained in the public eye and the recently introduced Patterson Metropolis is a rarity. At this workshop, we'll show these drives, explain how they might help you, and work through the details of what it actually takes to put one on your trike. Morning snacks and caffeine provided. Workshop begins when the caffeine kicks in. Bring a flat tube to fix and tire conundrums and puzzles. Go for a ride on nearby American River Trail afterwards