ROTWILD carbon frames are manufactured by hand. The starting material for the frame production are so-called prepregs. These are semi-finished fiber products in which the individual carbon fibers, some of which are up to 0.007 mm thin, are already pre-impregnated with epoxy resin (matrix). The quality of this pre-impregnation is decisive for the subsequent properties of the carbon frame. Only the constant distribution and the correct volume ratio of fiber to resin allow an ideal performance weight of the frame. If, for example, the resin content in the prepreg is reduced to save weight or minimized in the processing procedure, this can lead to fibers no longer being optimally embedded in the resin and thus no longer being able to transmit forces, especially under compressive stress.

The frames of ROTWILD bikes have a modular design. This means that different prepregs can be combined in such a way that the frame is optimally adapted to the occurring loads at different points. Therefore, different fibers are used in the production of our frames.


HT fibers

A fiber with high strength and excellent processing properties for the precision winding process. Due to its structure, the fiber does not twist and is particularly suitable for high-strength applications.

HT fibers with increased tensile strength and stiffness

A fiber with high tensile strength specifically designed for weight savings. It has excellent tensile bonding properties.

HT/HM with very high tensile strength and stiffness

The high-strength high-modulus carbon fiber (HM fiber) solves the challenge of combining high strength with low weight. This is made possible by a new sintering technology that enables fine control of the fiber structure at the nano level. The result is a significant improvement in performance compared to other carbon fibers. When producing a component, fewer layers are required for the same stability when using the HM fiber. The reduced wall thickness thus leads to a weight advantage.


The ROTWILD Carbon frames are mainly made of so-called HT fibers (HT = High Tenacity). However, the modular design of the frame allows us to use other carbon fiber types (HM = High Modulus or HST = High Strain and Tenacity) in addition to the HT fibers. In this way, special problems such as higher stiffnesses (HM) or the mechanical behavior of the frame in the event of stone impacts or impacts (HST) can be specifically improved.

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