The Schwinn Voyageur has a lightweight frame, 21-speed drivetrain for hills, comfort seat and grips.
The Sierra has a lightweight aluminum frame that's easy to ride. It features a suspension fork and rear suspension seat post. There's a 24-speed drivetrain and durable wheels for conquering climbs - and all-weather disc brakes.
The Duet is a wheelchair tandem that allows the front rider to enjoy cycling safely, with the back rider doing the work of pedaling and steering. The Duet does come apart easily (quick-release) for easier transport.