Schwalbe Marathon Racer 20x1.50 (40-406) HS429 Tire - The most popular recumbent trike tire by far. There is a reason that this tire is the default stock option on so many recumbent trikes. Every tire is a compromise of weight, speed, puncture resistance, and longevity and the Schwalbe Marathon Racer is the best option for the average trike rider.
HP Gekko Full Fender Set - A full set of fenders for your HP Gekko, to keep water or debris from flying at you or to just spiff up your trike and make it look cool.
HP Gekko Idler - Replacement Idler for the HP Velo Gekko. Not compatible with other HP trikes.
Falco 48V Lithium Battery (Charger + Holder Included) - The pack merely weighs 3.3 kg (7.2 lbs.) and it delivers 556Wh of energy (48V, 11.6Ah). The 48V battery pack has a number of primary as well as secondary protections. The packs use Lithium Ion Rechargeable battery cells from Panasonic.