The Big AL

For those who hunger for every ounce of performance possible, aluminum holds a very strong appeal. After all, who can resist aluminum's one-two punch of lighter weight combined with its impressive rigidity? Other tandem makers have never been able to offer an aluminum tandem that satisfies the most discriminating enthusiast, who will settle for nothing but a Co-Motion.

We're pleased to say that we have successfully combined the famous Co-Motion ride with the proven merits of Easton 7005 double-butted and triple-butted aluminum. If you know Co-Motion, you know that we aren't satisfied with the same tubing used by other tandem makers.

We started by specifying singular triple-butted one-piece top and lateral tubes (see features page). These tubes are large diameter along their entire length, not just in the center, so you benefit from their greater strength, cleaner lines, and a more accurately constructed frame.

Co-Motion tandems are renowned for excellent road manners and the Big AL capitalizes on our experience. Let us show you how a tandem can reward you for your hard-earned skills, while earning your confidence with its resolute integrity. The Big AL's fine handling balance combines our impeccable geometry with our unrivaled Co-Motion fork.

To make the most out of the power of two cyclists, we use large cross-section, non-indented oval chainstays, which we combine with lighter seatstays to maintain a more comfortable ride than other aluminum tandems. Combined with our double-butted seat tubes, big oval double-butted boom tube and center-relieved head tube, the resulting package is what you can expect only from Co-Motion: the best riding aluminum tandem available.

Frame Specifications
Frame Size 21/1822/1923/20
Head Angle 73°73°73°
Seat Angle, Captain 73°73°73°
Seat Angle, Stoker 73°73°73°
Top Tube, Front 21.75"22.5"23.25"
Top Tube, Rear 28.5"28.5"28.5"
Bottom Bracket Height 10.75"10.75"10.75"
Rear Axle Spacing 145mm145mm145mm
Seat Post Diameter 29.8mm29.8mm29.8mm
Standover, Front 30.5"31.1"32"
Standover, Rear 27.6"28.6"29.5"

Frame sizes are measured from center of bottom bracket to top of seat tube collar.
Standover heights are measured at mid top tube.
Top tube lengths are measured on effective horizontal.

Click here to find the right fit.

Tandem Componenet Package
Frame Easton 7005 select triple butted tandem tubing ForkCo-Motion taper-gauge Cro-Moly, with Co-Motion CNC tandem steerer
HeadsetRaceFace Thermo threadless Bottom BracketsShimano UN-52
CranksetRaceFace Tandem Chainrings54-44-32
BrakesAvid Single Digit 7 Brake LeversShimano Ultegra STI Flite Deck
Front DerailleurUltegra 6500 Triple Rear DerailleurShimano XT 9sp
CassetteLX 11-32 9sp ShiftersShimano Ultegra STI Flite Deck
Seat PostsZoom 29.8 mm SaddlesCo-Motion D2 Men's & Women's
Captain StemSalsa Moto-Ace 8-13cm Stoker StemTelescoping adjustable (see options)
ChainShimano CN-HG92 PedalsNone
HubsDT Hugi Symmetric 36h, 40h or 48h SpokesDT 14 gauge
RimsVelocity Dyad Silver TiresAvocet Fasgrip20 700x28
QR skewersSalsa HandlebarsProfile 40,42,44, or Stoker

Tandem Optional Equipment
Co-Motion max-adjustable stoker stem Co-Motion/WoundUp carbon tandem fork
Chris King headset Rockshox suspension seat post
Arai drum brake with QR kit Phil Wood tandem hubset
Shimano Ultegra Tandem Crankset package Bar-end shifters & 287-V brake levers in lieu of STI

Paint Options:

Stock colors:
  • Midnight Blue Metallic
  • Tropical Green Metallic
  • Pavo Purple Metallic
  • Prowler Yellow
  • Deep Red Metallic
  • Silver Metallic