Calfee tandems are the frames against which all others are measured

The benchmark in comfort, speed, fun, value and beauty.

In summary; a bike frame with carbon fiber tubing can be stronger, lighter, stiffer, more fatigue resistant and comfortable than a steel, aluminum, magnesium, titanium or hybrid-carbon tubing bicycle.  Our tandem frame design leverages the beneficial and intrinsic attributes of the carbon fiber material to manifest the best riding tandem bicycles in the world.

Road Tandem Frameset Order Form

Frame Pricing

Frame Geometry

Road Tandems

Our Calfee road platform combines all the necessary attributes for all types of pavement or light gravel excursions. We can either design your frame for time trials/road racing, dirt roads, or traveling. Pick and choose from an array of additional options. For example, we can add fenders & rack mounts, two types of coupler designs (see below), extra bottle mounts, and extra stiffness for larger teams.

Click Here to read about our travel tandem options


Tetra With One Set Of CouplersTetra Tandem Coupler



Tetra With Two Sets of Couplers

Our tandem frames, as light as the very lightest aluminum, titanium and hybrid-carbon frames from our competitors, set a new standard for comfort, durability, beauty, lateral-stiffness and power transmission.  We are doing for the tandem world today what we did for the single world in 1987; building a lighter, stronger, stiffer, more absorbent frame that is faster and more fun to ride.

Notably, we offer a double Gates belt drive option; you can pair a Rohloff internally geared hub with a Gates drive and timing belt.

Adventure Tandems

Where would you like to go on your next trip? If your answer is anywhere, then our adventure tandem is your choice. Designed to handle up to 700 x 45c tires, the possibilities for your next expedition is endless. From fire roads to gravel grinders, the Calfee Adventure tandem will get you there.

Our adventure platform comes with dual disc brakes (mechanical or hydraulic), fender & rack mounts, integrated front and rear light routing, and 45c tire clearance. Additional options can be added upon request.

Dragonfly Tandem



Tetra Off-Road Tandems

Calfee Design worked diligently to deliver you the most advantageous full suspension & front suspension off-road tandem platform in production. The ideal off-road tandem frame for a given team would fit the rider’s build, is very light and will absorb shock well. The Tetra Tandem handles crisply because of lateral stiffness and would deliver undiminished applied pedal power to the drive train. Off-Road Tandems are durable and not subject to fatigue failures and are strong enough to stand up to unexpected impacts and torsion forces. The Calfee finish is attractive and would resist corrosion or attack by the elements.  Our off-road tandem frames leverage the beneficial and intrinsic attributes of the carbon fiber material to realize these qualities.

Calfee Off-Road Frameset Order Form

Frame Pricing – Frame Geometry


    • Compatible with electronic drivetrains
    • Internal wire and cable routing
    • Off-Road Front Suspension Tandem (27.5″): $6,495
    • Off-Road Full-Suspension Tandem (27.5″)(includes X-Fusion Microlight RL shock):$9,195
    • Upgrade to Fox Float DPS for $50:

Bamboo Tandems

Bamboo Tandem

A functional and elegant alternative

There are many good reasons to choose Calfee Bamboo for your next tandem bicycle frame. Calfee Bamboo bicycle frames are very stiff, transferring power efficiently; are durable, resisting damage from stress and impacts; are comfortable, surpassing aluminum, steel, titanium and most carbon frames in smoothness. Our bamboo tubes mitered together and bound by epoxy soaked hemp fiber create a frame whose most notable characteristic, beyond beauty, is this incredible vibration dampening.

Frame Pricing – Frame Geometry

Compared to our carbon tandem frames, our bamboo enjoys similar ride characteristics.  The subtle weight penalty (a Large/Medium bamboo tandem frame weighs about 8.5 pounds) may be offset by our bamboo’s beauty, uniqueness, comfort and durability.  Our bamboo frames are an excellent choice for tandem teams interested in particularly rough roads.

Tetra Fat Tire Tandem

Ready to roll-anywhere!

This carbon fiber model is right at home on any terrain; sand, dirt, snow, including tens of thousands of miles of shoreline!


Frame Pricing – Frame Geometry

Tetra Convertible Tandem

We are excited to introduce a new model in our line of performance tandems, the Tetra Convertible.  This adaptable platform is wholly functional as both a tandem and single bicycle.

Precisely located S&S Couplings allow for the easy removal/addition of critical frame sections.  As well, component selection is optimized to support the very same.  A tandem team would enjoy a pedal as a pair one day, and the very next, one or both riders as solo cyclists.

Frame Pricing – Frame Geometry


Convertible Tandem Features

      • Tandem easily converts to a single and back again
      • Travel with this convertible tandem in regular luggage; fits in (1) 26x26x10 case and (1) 32x20x12 case
      • Stock or custom geometry; review stock tandem geometry here
      • Tetra Convertible Tandem frame retails for $10,795
      • Consider this drawing of the Convertible tandem frame
      • 25 year warranty




      Do you have any other interesting tidbits about your tandems? Sure!

      Our Dragonfly tandem earned the award for Best Tandem Bike at the 2013 North American Handmade Bicycle Show.  Calfee carbon tandem frames are coveted by the world’s best tandem cyclists as this three minute video evidences.  Enjoy this build detail about the Tetra 29er tandem with electronic shifting, pictured below.  Please consider this photo album to explore some frame finishes and component options.

      You don’t have to take our word for it; with over 25 years of advanced composites engineering and manufacturing, we’ve received volumes of feedback.  In all of those years, no collection of words comes close to “Our Calfee Journal; documenting the first year of ownership”.  This is a must read; an expert and objective accounting of a tandem enthusiast’s experience with our Tetra.

      Many of our clients are choosing to enjoy the many advantages of Shimano’s electronic Dura Ace and Ultegra groups, on both singles and tandems.  Owing to the absence of a triple ring option, we modify the rear derailleur to create compatibility with large, 36 tooth (or larger!) cogs.  The resultant gear ratio will get you up any mountain with only a double crank.  Further efficiencies are realized with Gates Belt Drive; all of our tandems are compatible.

      Importantly, both our Tetra and Dragonfly are compatible with all frame and fork options.

      Calfee Design 1-800-965-2171