Tandemonium Side-by-Side Tandem Cycle for Disabilities
Author: College of Engineering, Utah State University
Published: 18 Dec 2015 - Updated: 27 Aug 2026
Publication Type: Reports & Proceedings
Table of Contents:
Synopsis - Definition - Overview - FAQs - Insights, Updates - Related Content
Synopsis
This report describes Tandemonium, a student-built side-by-side tandem cycle designed to make outdoor cycling possible for people with disabilities. Key facts: the quadricycle was created by undergraduate mechanical and aerospace engineering students as their spring 2015 senior capstone project, with funding, mentoring, and manufacturing support from ICON Health and Fitness, and it was donated to Common Ground Outdoor Adventures in Logan, Utah. It affects riders with a wide range of physical abilities, including seniors and people with limited leg strength, because it can be operated with the feet or a hand crank and seats two people together. The design centered on four priorities - safety, accessibility, durability, and portability - addressing turning radius, braking distance, and visibility while remaining lightweight enough to transport. The information is useful because it documents a real accessible recreation device and the engineering choices behind it, offering a practical model for adaptive cycling that supports independence and shared outdoor activity for the disability community.*
At a Glance
- 1 - The cycle is nicknamed Tandemonium. Its two-seater layout lets a rider and companion sit side by side rather than one behind the other.
- 2 - The project was completed in April 2015. Minor modifications followed in preparation for its delivery to Common Ground Outdoor Adventures.
- 3 - Student Laura Birkhold said seeing the finished bike was the most rewarding part of the project. She noted the team had to combine varied experience and expertise to build it.
- 4 - The handover event was scheduled for 2 p.m. on December 22 at Common Ground, located at 335 N. 100 East in Logan. Media were invited to meet the designers and engineers who created the quadricycle.
Topic Definition
- Side-by-Side Tandem Cycle
A side-by-side tandem cycle is a multi-wheeled human-powered vehicle that seats two riders next to each other on the same frame, rather than in the front-and-back arrangement of a traditional tandem bicycle. Often built as a four-wheeled quadricycle for added stability, this type of cycle is commonly used in adaptive recreation because it allows a companion to ride alongside someone who needs assistance and can be equipped with more than one method of propulsion, such as foot pedals and a hand crank. That flexibility makes it suitable for riders with differing physical abilities, including people with limited leg strength, older adults, and those with disabilities who want to take part in outdoor cycling together.
Overview
The Gift of Recreation
In the spirit of giving this holiday season, the College of Engineering at Utah State University and ICON Health & Fitness will deliver a much anticipated gift to the staff and clients at Logan's Common Ground Outdoor Adventures.
On Dec. 22, USU and ICON will donate a student-built side-by-side tandem cycle that helps make outdoor cycling adventures possible for persons with disabilities. Members of the media are invited to attend and are welcome to speak with the designers and engineers who created this unique quadricycle dubbed "Tandemonium." The event takes place at 2 p.m. at Common Ground located at 335 N. 100 East in Logan.
Tandemonium was designed and built by a team of undergraduate students in the department of mechanical and aerospace engineering as part of their spring 2015 senior capstone project. Icon Health & Fitness helped fund the project and offered expert mentoring and manufacturing support along the way.
The two-seater cycle was completed in April and has since undergone some minor modifications in preparation for delivery.
In designing the bike, students concentrated on four important aspects: safety, accessibility, durability and portability. Safety challenges included turning radius, braking distance and visibility. The team wanted Tandemonium to be easily accessible for all body types and to be strong enough to ensure durability, but lightweight enough to be easy to transport. Tandemonium is unique because riders can use their feet or a hand crank to operate it.
Ambitious Project
Student designers say they were thrilled to be part of such an ambitious project.
"It was so easy to get tunnel vision and just design your part," said student Laura Birkhold. "Everyone brought a different experience and expertise to the table, without which we wouldn't have been able to build the bike."
Tandemonium taught the senior design team how to effectively communicate, work together and overcome problems, an invaluable experience for their future careers as engineers. They also learned how to work together even when difficult challenges came up.
"My favorite part was seeing it all come together in the end," added Birkhold. "For so long the bike was just a model on a computer screen or a list of parts we had to source. Seeing it actually in front of me and getting to ride it was the most rewarding experience of the whole project."
Frequently Asked Questions
NOTE: Researched FAQs by Disabled World (DW)
What is a quadricycle
A quadricycle is a four-wheeled human-powered vehicle that offers more stability than a two-wheeled bicycle, making it well suited to riders who need extra balance support.
How is a hand crank different from foot pedals on a cycle
A hand crank lets a rider power the cycle using arm and upper-body motion instead of the legs, which helps people who cannot use foot pedals to still ride and stay active.
What is a senior capstone project in engineering
A senior capstone project is a final-year assignment in which engineering students apply their skills to design and build a real product, often working with an industry partner for funding and mentoring.
Where is Common Ground Outdoor Adventures located
Common Ground Outdoor Adventures is based in Logan, Utah, at 335 N. 100 East, and it provides outdoor recreation programs for people with disabilities.
Why is side-by-side seating helpful for adaptive cycling
Side-by-side seating lets a companion or aide sit next to the rider rather than behind them, so they can offer support, communicate easily, and share the experience together.
What features make a cycle accessible for people with disabilities
Accessible cycles often include stable multi-wheel frames, easy boarding for different body types, secure seating, and more than one way to propel the vehicle, such as pedals or a hand crank.
Can seniors use a side-by-side tandem cycle
Yes, seniors can benefit from a side-by-side tandem cycle because the added stability, shared seating, and optional hand-crank propulsion make riding safer and less physically demanding.
How can outdoor cycling benefit people with disabilities
Outdoor cycling can improve fitness, encourage social connection, and provide a sense of independence and enjoyment for people with disabilities who use adaptive equipment.
Insights, Analysis, and Developments
Editorial Note: What makes Tandemonium worth remembering is how a classroom assignment turned into a working piece of adaptive equipment that a community organization could actually use. The engineering students did not just hand in a report; they solved for competing demands like keeping the frame sturdy yet light and safe yet simple, then passed the finished cycle to Common Ground Outdoor Adventures, where staff and clients put it to real use. For readers interested in adaptive recreation, the takeaway is that dual-input operation, feet or hand crank, opens riding to people who might be excluded by a standard bicycle, and the side-by-side seating means a helper or friend can ride alongside rather than out of reach. It is also a reminder that university capstone programs, paired with an industry partner, can produce genuinely helpful assistive technology rather than shelf-bound prototypes.*
Attribution/Source(s): This quality-reviewed publication was selected for publishing by the editors of Disabled World (DW) due to its relevance to the disability community. Originally authored by College of Engineering, Utah State University and published on 18 Dec 2015, this content may have been edited for style, clarity, or brevity.
* Editorial additions by Ian C. Langtree.