Knowledge database
Knowledge Base / Kontstruktion / ROTWILD Integrated Power Unit (IPU)
Brose Software Update 3.6
The software update provides noticeable benefits for the rider.
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Modul Monocoque Technology
The starting point for producing MMT carbon frames is our Seamless Fusion Procedure (SFT). With the help of this technology it is possible for our processing experts to smoothly interconnect frames...
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Saddle to bar drop, stack and standover
Saddle to bar drop and stack describe vertical frame measurements and relate to one another like top tube length and reach. The saddle elevation influences the rider’s seating position and determines...
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Bottom bracket height
The bottom bracket height is a very important but often insufficiently considered dimension in bike design. It determines the depth at which the rider is integrated into the bike in order to achieve...
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Steering angle, wheelbase and chainstay length
The three factors of steering angle, wheelbase and chainstay length play a decisive role in terms of the dynamic character of the bike. If, for example, only the reach is enlarged or the steering...
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Real and effective seat angle
Top tube length and reach always have to be considered in combination with seat post length and seat post angle in the development of bike geometry. With the introduction of seat posts that bend...
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Top tube length and reach
The top tube is the classic dimension for determining the length of a frame and is measured horizontally from the centre of the upper edge of the head tube to the central axis of the seat post or the...
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Kinematic analysis of the suspension system
The transmission ratio between rear swing arm and shock absorber is used to tune the chassis kinematics with the spring element. This consideration is generally travel-based, i.e. change in spring...
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Determination of the wheel trajectory curve
The wheel trajectory curve is determined by a straight line for the instant centre, which passes through the virtual pivot point and the axis of the rear wheel. The wheel trajectory curve is always...
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Determination of the virtual pivot point – four-pivot-point system based on the Horst link
The virtual pivot point describes a point that moves through the compression process, also known as the instant centre of rotation. During the course of the compression, the rear axle performs a...
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Why hasn’t the existing DH standard 150 mm been used?
The 150/157 mm (identical hub bodies with different end caps) DH standard has been derived from the 135/142 mm standard, in which the hub flange has been moved outwards by 7.5 mm on each side. This...
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MDI III - Setting the chainstay length
Setting the chainstay length involves two inlay kits, which are enclosed with the frame. The inlays screwed onto the inside have a screw connection to a rotating inlay chip on the outside. Apart from...
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IPU - the battery
A key constituent of the battery is known as the BMS – Battery Management System. Leakage of the cells caused during production makes it necessary to detect and monitor capacities, charge levels or...
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IPU - transmission ratio of the Brose engine
The power from the Brose electric motor is transmitted in two stages in a ratio of 1:27. In the first stage, a planetary gear with a transmission ratio of 1:9 is connected before the motor while...
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Recording the riding loads and definition of the constraints
The mountain bike is exposed to extreme loads. The large number of poor trails and obstacles on off-road routes in conjunction with riding skill but also kerbs, descents over steps, wheelies or jumps...
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Finite Elemente Methode (FEM)
The CAE method first involves calculating the deformation of the components due to the action of the load, e.g. forces or moments. Then the required stress is determined from the deformation and the...
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CAD functioning
In the CAD system, we create virtual, three-dimensional models of our components that match the real parts in terms of their geometric and physical properties.
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Manufacturing method: Forging
In forging, the forming takes place by means of the two dies moving against each other, producing the forging die. The forging die forms the negative shape of the finished forged part.
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Material properties of Al 6066 T6
Two different types of aluminium alloy are generally used for the production of bicycle frames – Al 6061 T6 and Al 7005 T6. Cycle frames have been produced from these two materials for decades, with...
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Preparations for the hydroforming process
Before the hydroforming process starts, the tube has already undergone numerous preforming steps. The difficulty in the hydroforming process lies in defining the necessary base wall thickness in...
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