Tetra Mountain Tandem
For wherever the trail leads you, Tetra Mountain is ready
Frame starting at $9,500
Strength • Build • Performance • Geometry • Build Kits • Technical Specs
Durability and Capability
Tetra’s carbon tubing is unmatched in terms of durability and strength, favoring a lower modulus carbon to achieve a robustness suited for your grandest adventures. Utilizing our unique layout, we can engineer this carbon to be compliant and supple in our leaf-spring chain and seat stays. This design offers vertical compliance without sacrificing torsional stiffness.
Define Your Build
The Tetra Mountain Tandem is compatible with 27.5″ or 29″ wheel sizes, rigid or suspension forks, and custom sizing to offer versatility to the rider. Fitting up to a 2.5 inch wide tire, Tetra Mountain allows you to customize the build to suit your needs.
Outlast and Perform
Our wrapped lug design provides a level of comfort and compliance that procures an astounding ride quality that few other bikes can deliver. Through more than 30 years of research, development, and advancements in the carbon bicycle industry, we’ve perfected our unique manufacturing process to develop the perfect tailored ride for every tandem team.
Travel Friendly
Utilizing S&S couplers, you can now conveniently travel with your tandem to wherever your adventure takes you. We incorporate couplers directly into your tubing, allowing you to split up your tandem into two or three separate pieces. When you’re piling your tandem into the back of your car for a road trip, or traveling half-way across the globe for a race, the coupler design makes your adventure just that much more travel friendly.
Build Kits
Our expert-selected build kits utilize your favorite components from the likes of SRAM, Shimano, Campagnolo, and more to deliver a well rounded package while eliminating the guess work related to tandem construction and specifications. Each unique build kit is thoroughly tested to ensure maximum reliability and performance. See available build kits for this model.
Geometry
Mountain Tandem Geometry
| Sizes | Size | Top Tube | Seat Angle | Stand- over Ht. | Front Center | Head Tube Length | Size | Stand- over Ht. | Seat Angle | Boom Tube |
| Small/Small | 45 | 58.4 | 73.5 | 78.1 | 66.8 | 12 | 40 | 69.7 | 73.5 | 72.3 |
| Medium/Small | 48 | 60.5 | 73.5 | 80.5 | 68.5 | 12 | 40 | 71.2 | 73.5 | 72.3 |
| Large/Small | 51 | 63.5 | 73 | 84.2 | 70.6 | 15 | 40 | 72.7 | 73.5 | 71.7 |
| Large/Medium | 51 | 63.5 | 73 | 84.2 | 70.6 | 15 | 43 | 74.2 | 73.5 | 71.7 |
| XLarge/Medium | 54 | 66 | 73 | 87.5 | 72.6 | 18 | 43 | 75.7 | 73.5 | 71.7 |
All frames have 33cm (13″) bottom bracket ht, 43cm (17″ chainstays)
Wheel/tire size of this chart: 27.5(650B) wheel size with 2.25″ (57mm) tire.
Need Custom Geometry or Need Help Deciding?
Build Kits
Our Build kits are designed to compliment your Tandem with the best that the industry has to offer. We spec out each build with top level components that meet our standards of excellence and performance.
Our build kits include all parts and components including headset, stem, seatpost, bar tape etc. Size specific parts can be decided upon communication with us through the sales process. Prices do not include wheels. Customer must source pedals and saddles independently. Contact us for full build sheets.
SRAM AXS 1X Eagle Flat Bar, Hydraulic
Component Highlights – SRAM AXS X01 Eagle 1x12s, Hydraulic SRAM G2 Ultimate brakes, Ignite Catalyst cranks, Carbon cockpits, Praxis bottom bracket, chain drive
$4,415
Technical Specs
Headset – 44mm
Dropouts – Titanium Integrated (142, 148 Boost spacing available)
Bottom Bracket (Captain) – Eccentric 54mm shell (to be used on with Problem Solvers Bushnell Eccentric)
Bottom Bracket (Stoker) – English 68mm BSA type shell
Brake Mount Type – Post Mount 180 Direct
Seatpost Diameter – 27.2mm
Front Derailleur Clamp – 35mm
Rear Derailleur Hanger – Affixed Titanium
Industry Leading Warranty
It’s no secret that Calfee Design bicycles last a long time. We understand the importance of longevity in the cycling world, and engineer are frames to withstand the test of time. This is not a guarantee we take lightly. All new Calfee Design bicycles are backed by a 25 year warranty.
Contact Us to Begin Building Your Dream Tetra
<< Back To Mountain Tandems
Traveling with Your Tetra Tandem?
Tetra With One Set Of Couplers
One set of couplers splits your tandem into two separate pieces, allowing for easy storage in your garage or car. One set of couplers installed on your new tandem retails for $1250.
Tetra With Two Sets of Couplers
Two sets of couplers splits your tandem into three separate pieces, allowing for easy long-distance travel via planes or other tight traveling situations. Two sets of couplers installed on your new tandem retails for $2500.
Travel Cases
Custom engineered had-shell traveling cases to protect and pack your tandem. Travel case come fitted with tube protective wrapping to fit your specific tandem, custom fork mount, wheel bag, frame mounting points. Have peace-of-mind that tandem is safe and secure during travel!
