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Co-Motion Steelhead Di2

Co-Motion Steelhead Di2
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The Co-Motion Steelhead might be the finest tandem we've ever had on our showroom floor. For adventuring or touring on pavement or off, the Steelhead excels at everything.

The Steelhead's frame is handbuilt from Reynolds 631 cro-moly steel in Eugene, Oregon. Reynolds 631 tubing delivers excellent ride quality, brilliant handling and exceptional strength for high performance tandems. The frame tubing has been custom shaped and butted, keeping weight down while maintaining confidence-inspiring torsional strength. The "boom tube" (frame tube between the cranksets) is ovalized for flex-free power transfer. Thru-axle dropouts ensure precise brake rotor alignment and add an extra dash of handling precision. Flat-mount brake caliper installation reduces overall weight and promotes more even pad wear, especially during hard braking. Hooded rear dropouts allowed Co-Motion to build the Steelhead with extra-stout chainstays and seatstays for improved strength and power transfer at the rear triangle. A tandem-specific carbon fiber fork soaks up vibration, keeping the captain's hands more comfortable and prolonging headset life. Rack, fender and bottle mounts are found throughout the Steelhead's frameset, making the bike more versatile for extended tours, or just a trip to the farmer's market. The geometry is optimized for 700c wheels and 35-45mm tires.

For those who think electronic shifting is overkill on a tandem, the Shimano Ultegra Di2 drivetrain is a game changer on the Steelhead. Every shift is perfect. Every. Single. Time. The Di2 system will even trim the front derailleur for you automatically as you shift across the rear cassette. Clumsy shifting on steep grades is no longer a gamble, as the Shimano Di2 motors operate with lightning-quickness. The Di2 battery is tucked inside the seat tube, keeping it out of the weather. A single battery charge lasts for 900-1,000 miles, depending on shift frequency. Recharging is done at the junction box under the stem. An alloy Co-Motion crankset with 50/34T compact chainrings matches with an 11-40T Shimano cassette, bringing a massive gearing range to every challenging climb.

Astral's tubeless-ready Outback wheels were chosen for the Steelhead, ensuring durability and high performance to tandem riding in all conditions. The 36-spoke rims boast a 25mm width, allowing tires from 35-45mm wide. California-made White Industries CLD (Center Lock Disc) thru-axle hubs and Sapim stainless steel spokes bring a seriously robust build quality to the Steelhead's wheels. Shimano Ultegra hydraulic disc brake clamp onto 203mm TRP brake rotors, bringing confident speed control and power to every ride, rain or shine (or mud).

The Steelhead features alloy seatposts, and and FSA SL-K alloy stem and FSA Omega handlebar for the captain. The stoker gets a classic stoker bar and an adjustable alloy stem for easy fit tweaks.

A Shimano Di2 charging cable is included with the purchase of this bicycle.


Frame Reynolds 631 air-hardened steel, 44mm head tube, 12mm thru-axle dropouts, Internal Di2 wiring ports and external Hydro brake mounts
Fork Co-Motion 1.5” TA carbon fiber fork, thru-axle dropouts
Headset Cane Creek 110 Tapered
Rims/Wheels Astral Outback Boost thru-axle wheels, 25mm intenal rim width, 36-spoke
Hubs White Industries, high-flange, centerlock rotor
Spokes Stainless steel, round, J-bend
Tires WTB Riddler 700x45mm
Crankset Co-Motion alloy
Chainwheel 50/34T
Bottom Bracket Adjustable eccentric front/External bearing rear
Chain Shimano 11-speed Ultegra/Gates timing drive belt
Front Derailleur Shimano Ultegra R8050 Di2
Rear Derailleur Shimano Ultegra R8050 Di2, Shadow-style, long cage
Rear Cogs Shimano, 11-40T
Shifters Shimano Ultegra R8050 Di2
Handlebars FSA Omega compact alloy and Co-Motion alloy stoker bar
Tape/Grips Cork tape
Stem FSA SL-K and Co-Motion alloy adj. stoker stem
Brake Levers Shimano Ultegra, R8050 hydraulic
Brakes Shimano Ultegra R8070 hydraulic disc, flat-mount, 203mm TRP rotors
Saddle Selle Italia Nekkar & Lady Flow, alloy rails
Seat Post Co-Motion alloy 31.6mm
Accessories & Extras Shimano Di2 charging cable

* Subject to change without notice.