The Scorpion fs 20 is the foldable, easily transportable version of HP‘s most famous Scorpion product line that is also geared towards fast speeds through extra aerodynamics. 

In the end, it is all about a tradeoff, a low rider position might not be comfortable for everyone, but it is more aerodynamic and therefore fast for a 20 inch rear wheel trike. 

Add a good gearing system and you have a fast and reliable trike.