da Vinci Designs Symbiosis XC Tandem

Now available with a STEP electric assist motor. See the “Other Options & Upgrades” tab below.

Di2  3 x 11 Electronic Shifting Shift Upgrade available

This bike is the benchmark cross-country off-road tandem.

So far we have won most of the races ever entered with this bike. 24 Hours of Moab, Leadville 100, Vail Ultra 100…
Dropped top tube for better stand-over and suspension adjusted geometry. It screams “Take me down that fire road.” The Symbiosis XC comes with a race tested suspension fork and a 100mm (4″) travel Thudbuster seat post.

Symbiosis XC Components

Frame Material
Retail Prices
$6995 Reynolds Chrome-moly Steel
$9095 Chrome-moly with S&S Couplers*
$7275 Custom Reynolds 7005 Aluminum
$10495 Titanium
$14995 Titanium with S&S Couplers*
$10895 Carbon Fiber**
$13995 Carbon Fiber with S&S Couplers*
*S&S Couplers allow the frame to be taken apart and fit into a small travel case. Also includes : reusable frame pads, Easy-Split cable separators, and self extracting crank bolts.
**Carbon Fiber frames have limited tire clearance. 26″ with 2″ tires max.
Fork MRP Stoke Tandem Fork 80mm, 100mm, or 120mm
Shifters Shimano XT 3×11 – – Option XT Di2
Rear Deraileur Shimano XT – – Option XT Di2
Front Deraileur Triple – – Option XTR Di2
Brakes Avid BB7 Front and Rear Disc with 200mm rotors
– Option XT Four piston Hydraulic with 203mm Icetech rotors
Front Bars Flat or riser mountain bars
Rear Bars Profile Stoker 26 – 47cm
Front Stem Thomson Elite X2
Rear Stem Control Tech Adjustable Stoker
Cranks da Vinci Designs Billet Machined (wide choice of lengths)
Rear Cogs 11-36 or 11-40
Driving Gears Shimano Hyperglide 13-21-28
Equivalent to 24-39-53 or even lower gear options
Eccentrics da Vinci Designs
Front Hub White Industries XMR Boost 110 x 15
Rear Hub White Industries Tandem Disc – 145mm
Rims 26″, 27.5″ or 29″ Velocity Blunt 35
Tires Picked for your application.
Front Seatpost Thomson Elite 31.6mm
Rear Seatpost Thudbuster LT
Saddles Selle Italia Man Flow and/or Lady Flow
Colors Click here to see the Paint Colors page

NEW Shimano Di2 $2200 upgrade
XTR 11×3 with Handlebar Display unit so you can see what gear (front and rear) you are in as well as battery level and easy charging port.

Di2 with four piston hydraulic brakes and 203mm Icetech rotors $2800

Other Upgrades, Options and Additions

Di2 Electronic Shifting Built with XTR triple front derailleur, XT rear der, and display $1900
Electric Assist Built with Shimano STEPS E8000 motor and BT-E8010 battery $3700
White Industries Freewheels These are the highest quality freewheels made and have been adapted to our Independent Coasting Drivetrain. Durable, precision, and sealed. 17, 18, or 19 tooth $185
Titanium Bottom Brackets Same design as stock (See Components page) Save 55g each or 110g per tandem $75 ea
Cane Creek 110 Headset The best headsets money can buy. Cane Creek has 110 year Warrantee. $75
Black Hubs and Spokes This option is for bikes with White Industry Hubs. $40
Spinergy TX2 Tandem Wheels Ask about availability Ask

Options & Upgrades


200mm, 180mm, 175mm, 172.5mm, 170mm, 167.5mm, 165mm, 160mm, 150mm,  3 hole 130/150/170mm, or  3 hole 120/140/160mm

(F= Folding, W=Wire bead)
Description Actual Width Weight  
Panaracer RIBMO 700×28 /F Great, long wearing, stable, fast, and
good puncture resistance.
1.10″ (28mm) 392g  
Panaracer RIBMO 700×32 /F Wider version of above tire. 1.25″ (32mm) 400g  
Panaracer RIBMO 26″x1.25″ /F Great, long wearing, stable, fast, and
good puncture resistance.
1.18″ (30mm) 355g  
Panaracer RIBMO 26″x1.5″ /F Wider version of above tire.  1.45″
Continental GP Four Seasons
700 x 28mm /F
Great road tire   ***Add $70 for the pair 1.10″ (28mm) 280g  
We have other tires. We stock tires from skinny to knobby, please ask.      


Captain Stem
10 deg. rise 60, 70, 80, 90, 100, 110, 120, 130mm N/C
17 deg. rise 60, 75, 90, 100, 110, 120, 130mm N/C
25 deg. rise 75, 90, 105,120mm N/C
40 deg. rise 75, 90, 105,120mm N/C


Captain Drop Bars
FSA Wing Compact Comfortable shape drop bars with a shallow drop. 44cm (default), option 42cm N/C
Profile Cobra Carbon Fiber drop bars with ergonomic contours $225
ENVE Composites What can you say, ENVE Composites drop bars, are light, strong, the best $306


Stoker Stem
Control Tech Adjustable Long 200 to 255mm. They can be cut shorter. N/C
Control Tech Adjustable Medium 170 to 225mm. They can be cut shorter N/C
Extra Stoker Boom Long stoker stem boom to switch between an adult and child stoker,
and the adjustment of the stoker stem is not enough.
2″ (50mm) Stem Riser This stem extension works with most bars to raise,
or move it closer. .
Fixed Length Titanium Half the weight of an adjustable stem. Available in 160mm, 180mm, or 200mm. Custom length available for addition cost. $125


Stoker handlebars
Profile Stoker Bars 47cm wide Light, comfortable, multiple hand positions. Allows most fore/aft reach
Profile WingA Stoker Bar 46cm Same as above with OS Clamp (31.8mm) “Wing” flat area for comfort. $37
Profile Cobra Wing Stoker Bar 46cm Some as WingA above but carbon fiber, lighter, and hand contours for even more comfort. $225
46cm Wide Drop Bars Wide drop bars to clear the captain’s hips (price includes Cane Creek stoker levers). $49
44cm Profile Cobra Drop Bars Profile Cobra carbon fiber drop bars with Cane Creek stoker lever. $274
44cm ENVE Composites Drop Bars ENVE Composites carbon fiber drop bars with Cane Creek stoker lever. $355
Flat Mountain Bars Some prefer the wider flat bars. Lighter, too. N/C
25 to 90mm Riser Bars For tall stokers with short captains, or stokers who like to sit up more. $20
Bar ends Add comfort and hand positions to flat bars or riser bars. $25


Child Adapter
Child Kit Clamps to rear seat tube for higher crank location. Price includes
BB Spindle and length of chain. This works great with our Three Hole Cranks
Extra Stoker Boom Long stoker stem boom to switch between an adult and child stoker,
and the adjustment of the stoker stem is not enough.


Stoker Seatposts
Thudbuster Short Travel Lightest shockpost we stock., 440g.
Includes different elastomers to tune spring rate.
Thudbuster Long Travel Longest Travel, requires 144mm from saddle rails to top of seat tube, 565g.
Includes different elastomers to tune spring rate.
Cirrus Kinekt Seatpost 2.1 Advanced suspension design. Adjustable, active, comfortable.       Add $100  529g
Available in three weight ranges: 100-150lbs, 150-200lbs, 200-250lbs. 


Sella Italia Man Flow (TransAm) and/or Lady Flow (TransAm)
Velo Pronto and Serina Men’s and/or Women’s
We have other saddles. Call to inquire.