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.Duratec builds high quality tandems, tandems for winners. Kieran Modra and David Edwards won a gold in the pursuit at the World Championships in 2016.
Big Bang T9 is a racing tandem specially intended for sprint and pursuit. Large-diameter tubes made of 7020T6 aluminium alloy are used for construction of the frame. The large diameters of the tubes ensure the rigidity of the frame and effectively resists stress in the direction of torsion. For track disciplines the conversion of force from pedalling to acceleration is a core requirement. Overall this is an extremely high quality frame concept in terms of strength and rigidity. The riding position and position of the riders in terms of each other is an important parameter, in particular for track disciplines. Duratec offers 14 basic sizes in the standard offer. The geometry is designed according to the height of the riders so that the length of the rear rider's top tube is shorter and they adopt an aerodynamic position without excessive space between each other. If requested, it is possible to make the frame to order according to the individual requirement of the riders.
DURATEC F02 front fork is made of 7005T6 aluminium alloy and has conical post 1-1/8“-1-1/2“, crown diameter 50 mm, weight 720 g. The fork is offered in many variants according to the individual disciplines and selected types of brakes. For example road for calliper brakes, road for disk brakes, track fork etc. The crown diameter seamlessly blends with the frame head, and the transition between these parts is compact. The fork is certified for tandem use.
Very difficult thing are the crancs for tandems. We very often use the cranks GEBHARDT. It is customized work. It means the customer can choose the lenght of cranks, right transmision and the other requests like colour. First transfer 1:1 is 36-36, second transfer 48-36-26. The axle ISIS or square. More information are on www.gebhardt.cz. Colour: black, red, silver. More info on www.gebhardt.cz
Very frequently discussed topic in the tandem cycling is a stiffness and resistance to torsion. Frame Big Bang R9 achieves high torsional rigidity mainly due to the tubes used for its construction. It is a material 7020T6 and oversize tube diameters. The lower and central tube having a diameter of 52 mm. At the middle of the frame tubes are specially shaped to resist high loads.