RideTandem

2011
da vinci global venture

This is a da Vinci Designs Global Venture 26” road tandem with independent drive and S&S Coupling of a chromoly steel frame. Built in December 2011, this "Pegan Gold" beauty is customized with an X-Long rear, a medium long front and large height. It generously fits a 6’5” captain and a long-waisted 5’9” stoker and since it has da Vinci ICS there is no chain rub on the chain stays which can be common on extra-long bikes.

DA VINCI Design's independent coasting system (ICS)

da Vinci Designs’ Independent Coasting System (ICS) offers you a tandem bicycle riding experience both on and off road that equals or surpasses the best you’ve had on a single or tandem bike. The ICS makes for a far more intuitive, comfortable and efficient ride. This newfound ability to independently or collectively coast, pedal and position your cranks at will offers these advantages:

Starting, stopping and going through corners are as easy as on a single bike.
Captain and stoker can independently relax, take a drink, adjust seat position, stand for a few seconds to relieve weary sit bones, even take a moment to gaze at scenery, while the other keeps pedaling.
Traversing obstacles is easier and more efficient because the captain and stoker can coordinate avoiding the obstacles while maintaining forward momentum.
Asynchronous pedaling decreases strain on the final drivetrain.

The main component of da Vinci Designs’ ICS is an intermediate drive shaft six inches in front of the rear bottom bracket. The intermediate shaft has two single-speed freewheels on the left side that are independently driven by the cranks at twice the rotating speed and half the torque. On the right side of the shaft, four Hyperglide™ cogs drive the bike. The chain rings are half the size as those on a conventional tandem because of the double rotation of the intermediate shaft. The combination of 12-, 18-, 24-, 30-tooth driving gears equals 24-, 36-, 48-, 60-tooth chain rings. The combination of the small 6-tooth gap, doubled rotation and the Hyperglide cogs gives da Vinci Designs’ tandems these technical advantages:

Smooth and fast front shifting – The closer the chain rings are to the same size, the easier it is to shift. Other tandems, and even single bikes, are forced to use a 12-tooth gap between chain rings.
Unprecedented range of gears – Four chain rings and eight rear sprockets mean 32 gears that range from 18 to 140 gear-inches. No other tandem gives you that many gears or that kind of range.
More ground clearance – Nice when you lift your tandem over a curb, out of a truck, or when you are off road.
Stronger, lighter chain rings that are less prone to bending
Less strain on the chain while shifting

Source: https://www.davincitandems.com/best-tandem-bicycle-drivetrain/

check out these components!!

Campagnolo Chorus Ergo Carbon Shifters
Modified SRAM X-9 Rear Derailleur
Campy Triple Front Derailleur to “trim” as needed
Avid BB7 Disc brakes (front and rear)
Front bars – FSA Compact Wing OS drop bars
Profile Stoker “bull horn” bars
Wound Up X2 carbon fork
Bontrager Race Lite OS front stem
Control Tech adjustable stoker stem
da Vinci Cranks (175 and 172.5 )
11-32 9 sp rear cogs
12-18-24-30 chain rings (as described above)
White Industries hubs
Rolf Prima 26” wheels (benefits shown below)
Thomson Elite and Thudbuster ST seatposts
Sella Italia saddles
Schwalbe Marathon Plus tires (new June 2021)
3 King Stainless water bottles cages

PLUS - -

S&S couplers and Easy-Split cable separators, spanner wrench, and self extracting crank bolts which allow the frame to be taken apart and fit into travel cases. Tube wraps for travel and additional mountings for rim brakes, racks included. (Ask about a rear rack and 26" x 26" x 10" airline allowed travel cases.)

Pedals are NOT included

Benefits of 26” wheels on a tandem:
26” wheels are stronger than 700c wheels and tandems carry more weight than singles
Disc brakes are stronger with 26” wheels as the rotor has more leverage
26” wheels with less inertia and weight will accelerate more quickly and climb better
26” wheels offer a versatile tire selection allowing an easy transition to gravel