Use this gearing calculator to figure out gear-inches for combinations of Pinion gearboxes, Schlumpf drives, Rohloff Speedhub, derailleur systems, and many internally geared hubs including SRAM 3x7 and Dual-Drive. Also, since gear-inches is not really a measure of mechanical advantage (thus, won't give indication of such for shorter or longer cranks), we provide a "normalized" gear-inches number, which indicates the effective mechanical advantage of the system in terms of standard 170mm cranks.
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Recumbent gearing calculator
AlphaBENT has extensive experience servicing most brands of trikes including those made by Terratrike.
HP Velotechnik makes premium recumbent products in Germany. An extensive lineup of models includes two-wheelers, three-wheelers, electric-assist, and an array of suspension systems for comfort.
Catrike has built a just-in-time manufacturing plant in the USA producing top-quality aluminum recumbent trikes in a wide array of capabilities.