Tandem Big Bang R9 — Designer — Duratec

BIG BANG
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The most popular groupsets

Recommended groupset Price incl. tax Weight
Shimano GRX 400 DT Swiss Ritchey Comp 99 740 Kč 14545g
Shimano GRX 600 DT Swiss Ritchey Comp 100 828 Kč 14439g
Shimano GRX 810 DT Swiss Ritchey Comp 112 877 Kč 14208g
Shim. GRX 815 Di2 DT Swiss Ritchey Comp 135 550 Kč 14244g

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BIG BANG

GRAVEL disc brakes

BIKE PRICE
from 99 740 Kč
with groupset
Shimano GRX 400 DT Swiss Ritchey Comp

Color

Frame colour Logo colour Colour - upper part Colour - bottom part Logo colour Colour of saddle Colour of tape Base Frame Loading
  • Design

  • Mono Mono

    Frame colour

    • 1501 White
    • 1502 Black
    • 1505 Classic Silver
    • 1508 Light Bronze
    • 1511 Classic Yellow
    • 1513 Spring Green
    • 1515 Light Blue
    • 1517 Pure Orange
    • 1518 Pink
    • 1520 Red
    • 2040 Attractive Green
    • 2041 Ultramarine Blue
    • 2042 Bianchi
    • 2043 Light Pink
    • 2044 Dark Grey

    Logo colour

    • CA171 White
    • CA172 Black
    • CA173 Silver
    • CA174 Titan Grey
  • Speedline Speedline

    Colour - upper part

    • 1501 White
    • 1502 Black
    • 1505 Classic Silver
    • 1508 Light Bronze
    • 1511 Classic Yellow
    • 1513 Spring Green
    • 1515 Light Blue
    • 1517 Pure Orange
    • 1518 Pink
    • 1520 Red
    • 2040 Attractive Green
    • 2041 Ultramarine Blue
    • 2042 Bianchi
    • 2043 Light Pink
    • 2044 Dark Grey

    Colour - bottom part

    • 1501 White
    • 1502 Black
    • 1505 Classic Silver
    • 1508 Light Bronze
    • 1511 Classic Yellow
    • 1513 Spring Green
    • 1515 Light Blue
    • 1517 Pure Orange
    • 1518 Pink
    • 1520 Red
    • 2040 Attractive Green
    • 2041 Ultramarine Blue
    • 2042 Bianchi
    • 2043 Light Pink
    • 2044 Dark Grey

    Logo colour

    • CA171 White
    • CA172 Black
    • CA173 Silver
    • CA174 Titan Grey
  • Colour of saddle

    • Eclipse Black
    • Arctic White
  • Colour of tape

    • Eclipse Black
    • Arctic White
  • Logo on frame

    Choose your logo

Extra charge paintjob:
Inclusive

Extra charge logo: 0 Kč

  • Change background

    • Dark
    • Light
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Favouriter designs:

Frame size

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VR
 
cm
VR
 
inch
VP
[1]
cm
VP
[2]
cm
A1
[1]/[2]
mm
A2
[1]/[2]
mm
B2
[1]/[2]
mm
C1
 
mm
C2
 
mm
D
[1]/[2]
mm
F
 
mm
G
 
mm
H
 
mm
K
 
mm
L
 
mm
O
[1]/[2]
mm
R
[1]/[2]
mm
S
[1]/[2]
mm
α
 
mm
β
[1]/[2]
mm
48/46 18,9/18,1 165-172 149-168 520/685 504/684 480/460 453 460 278/278 125 599 1737 50 77,1 718/698 361/562 575/462 70,0 74,5/75,0
52/48 20,5/18,9 173-175 165-172 535/705 517/699 520/480 453 460 278/278 135 604 1763 50 73,7 750/725 367/567 586/500 70,5 74,0/74,5
54/50 21,3/19,7 176-178 168-174 550/715 532/709 540/500 453 460 278/278 145 615 1778 50 70,4 769/744 379/566 598/519 71,0 74,0/74,0
56/50 22,0/19,7 178-182 168-174 560/715 542/704 560/500 453 460 278/278 155 620 1788 50 70,4 794/753 380/562 607/537 71,0 73,5/74,0
56/54 22,0/21,3 178-182 174-178 560/725 542/724 560/540 453 460 278/278 155 620 1798 50 70,4 781/773 380/572 607/537 71,0 73,5/74,0
58/52 22,8/20,5 183-188 172-177 570/720 552/709 580/520 453 460 278/278 175 631 1804 50 70,4 814/772 384/556 626/556 71,0 73,5/74,0
58/56 22,8/22,0 183-188 178-182 570/730 552/727 580/560 453 460 278/278 175 631 1809 50 70,4 800/792 384/565 626/556 71,0 73,5/73,5
60/54 23,6/21,3 189-194 174-178 585/725 566/716 600/540 453 460 278/278 185 634 1820 50 67,1 831/791 390/562 638/574 71,5 73,0/74,0
62/56 24,4/22,0 195-200 178-183 600/730 581/719 620/560 453 460 278/278 205 650 1834 50 67,1 851/809 399/555 657/593 71,5 73,0/73,5

 

Dimension

Summary

Thank you for your interest in a customised bicycle built by us.

You can now either SAVE AS PDF which you can print out for yourself or you can. START AGAIN if you feel that the configuration needs to be changed. EMAIL US to allow us to look over your configuration and we can advise by calling you direct. ADD TO BASKET will confirm your order with us and we will contact you by telephone to confirm. Payment is made at the time of order. Thank you

Price for complete bike 0 Kč

Weight 3400g

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BIG BANG GRAVEL disc brakes

Tandem, or a bike which two cyclists ride and pedal together. There are more or less two kinds of people who ride tandems: those who have completely fallen under the spell of tandem pedalling and have become aficionados and fans, and those for who it is the only means of movement and active sport as a result of their disability.  In the second case a blind or otherwise disabled rider sits behind the front rider.  

Building a tandem requires a highly individual approach, especially in its geometry and design. It is necessary to combine two frame sizes so that the result suits both riders.  Thanks to its custom production and mainly to its extensive experience of many years with tandems, Duratec, can fine tune and design the frame geometry and then manufacture the frame and naturally also assemble the complete tandem. Duratec is the official partner of many national teams of disabled athletes around the world.  Representatives of Australia, the Netherlands, Brazil, Ireland, Greece, Russia, Belgium, Austria, Germany, Spain and many other countries are the best references for our products. 

Big Bang G9

Big Bang G9 is a gravel tandem bike designed for more demanding terrain such as gravel and dirt roads, but having the advantages of a road bike. In general a gravel bike, equipped as a cross between a mountain and road bike, allowing riders to get to know more difficult terrain without any fear of defect while flying down roads under the power of two riders.

As on all DURATEC tandems, large diameter tubes made of 7020T6 aluminum alloy are used to build the tandem frame. The large diameters of the tubes ensure the high rigidity of the frame and ability to resist stress in the direction of torsion, which is a very important parameter, especially in tandem bikes that have a frame of about 1.5 meters in length. In terms of strength and rigidity, it is a very high-quality frame and this is the reason for its popularity around the world.

For this model, Duratec has produced a completely unique double crankset designed exclusively for Shimano GRX, the installation of which guarantees that the drivetrain, i.e. both chains, are placed on the right-hand side. The size of the crankset is 31 teeth and the gears shift in two variants, namely 46-31 or 48-31. For choosing electronic shifting, we have adjusted the frame so that the Shimano Di2 cabling can be routed through the space inside the frame. The battery is integrated into the seatpost of the rear rider. All available variants and current prices can be found below in the details or on the Configuration page.

Standard equipment
Eccentric bottom bracket for tensioning the chain between the centers, 1+2 pairs of basket inserts (exact number according to the frame size), replaceable Syntace rear derailleur chain holder, seat clamp diameter of 31.8 mm, design for pilot-operated hydraulic disc brakes, headset 1 1/8”- 1 1/2” FSA ORBIT IS; rear dropouts for a fixed axle size of 142x12 mm; drivetrain only on the right-hand side; mechanical shifting

Extra version
Adjusting the geometry of basic sizes according to the figures of the riders; two-color design according to the configurator option (Speedline); prepared for mounting mudguards and carriers; design for Shimano Di2 or eTap electronic set

Connecting dimensions
Frame geometry for Duratec fork with a height of 397 mm, Duratec F02 fork is equipped with a 100/15 mm Sram Maxle fixed axle, Post Mount front brake mounting, fork steerer 1-1/8” ÷ 1 1/2”, steerer length 320 mm, frame for a wheel diameter of 28” (622), Syntace X12 rear triangle width 142x12 mm for tires with a maximum width of 45 mm, maximum rear brake disc diameter of 180mm, Post Mount rear brake mount, mechanical shifting; seatpost diameter 27.2 mm

Frame geometry - Download a table with the frame geometry here 

Big Bang G9

The DURATEC F02 front fork is made of aluminum alloy 7005T6, conical post 1-1/8”-1-1/2”, crown diameter 50 mm, weight 720g. The fork is for the gravel tandem Big Bang G9, offered for a disc brake with postmount. The mounting of the front wheel on a fixed axle of 100/15 mm. At the customer’s request, it can be prepared for mounting a front carrier and mudguard.

Big Bang G9 Big Bang G9

▲ Details of the crankset located with the pilot. The number of teeth of the crankset is 31 teeth. Gear ratio 1:1. The gearsets were developed by DURATEC and are designed exclusively for DURATEC tandems, which are manufactured in their workshop by CNC milling. Shimano GRX tandem cranksets are equipped with a carbon coating, which is also manufactured directly in Duratec.

▲ Details of the cranksets located with the passenger. Specially designed double crankset for connecting the pedal centers of both riders in the size of 31 teeth and a gear ratio of 1:1. The gearshift is located next to the passenger and we offer them in two variants of 46-31 and 48-31 teeth.

Big Bang G9 Big Bang G9

▲ A very frequently discussed topic in tandem cycling is the rigidity of the frame and the resistance to torsion. Tandem frames are much longer and have higher demands, especially on torsion. The Big Bang frame achieves high torsional rigidity thanks to its construction and especially by using tubes made of large diameter 7020T6 aluminum alloy. The bottom and center tubes have diameters of 52 mm. In the middle, the tubes are specially shaped to withstand high loads.

▲ Details of the left rear dropout designed for the Syntace X12 fixed axle (142x12mm) designed for mounting the rear brake with the postmount system. The right dropout is adapted for mounting an interchangeable Syntace hanger, which is part of the frame.

Big Bang G9 Big Bang G9

▲ If the customer wishes, it is possible to prepare the frame for mounting rear and front carriers. The photo shows the rivets with a screw ready for mounting the rear carrier, which is also mounted in the lower part to the prepared thread in the right rear dropout. The optimum wheel clearance in the rear triangle is for 40-45 mm tires.

Big Bang G9 Big Bang G9

▲ The Di2 cabling is routed through the space inside the frame. The battery is located in the seat tube of the second rider. Elegant entrances via grommets fix the cables in the frame. Di2 electronic shifting is very popular for this type of bike.