This is an amazing off-road handcycle. Titanium frame and Power Assist (and Throttle) Extra Battery Included. The vast majority of recumbent trikes use front cranksets and chainrings borrowed from regular bicycles. These have sharp-edged exposed chainrings, making them hazardous to riders and passersby. The front derailleur is also exposed to the elements and may periodically go out of adjustment, making shifting noisy and difficult. At Ti-Trikes, we decided to take a different approach, selecting a fully enclosed planetary front gear system called a Patterson Transmission. Shifts perfectly while pedaling, under full load, or at a standstill. More expensive, but worth it.