The latest iteration of the TM5 rim is the result of a focused development process in which weight, structural integrity, and reproducible test performance were central. In this update, both the design and production process have been further refined, resulting in a lighter rim that demonstrably performs better under impact loading.
Weight reduction while maintaining structural performance
Through optimization of the lay-up and material distribution, the TM5 rim has been reduced in weight by 50 grams. This reduction in rotating mass directly contributes to improved dynamic performance, without compromising the strength or durability of the product.
Impact test: 130J under controlled conditions
To objectively validate impact resistance, the rims were tested using a consistent and repeatable method based on a drop-weight test:
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A mass of 24.5 kg is released in a controlled manner
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The impact energy equals 130 joules
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The test is performed on a bare rim (without tire or insert)
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Impacts are applied at four different positions on the rim
For reference, the standard set by the Union Cycliste Internationale (UCI) requires an impact resistance of approximately 40 joules for approval. The TM5 rim is therefore tested at a significantly higher energy level than the minimum requirement.
By testing without a tire or damping material, the full impact energy is directly introduced into the rim structure. This represents a worst-case scenario and places high demands on energy absorption and stress distribution within the material.
The updated TM5 rim passes this test without structural failure, confirming that the combination of lay-up optimization and geometric adjustments is effective.
Test video here.
Lay-up optimization: targeted fiber orientation
A key part of the performance improvement comes from an optimized lay-up. By locally refining fiber orientation and layering, impact forces are absorbed and distributed more efficiently throughout the rim structure.
Particular attention has been given to critical zones such as the rim bed and the transition to the bead. Here, the balance between stiffness and energy absorption has been carefully tuned, resulting in increased resistance to both initial impact and crack propagation.
Geometric improvement: centered access holes
In addition to the lay-up, the geometry has also been refined. The access holes in the rim bed are now drilled centrally instead of off-center.
This change has a direct impact on stress distribution in the bead seat zone. By positioning the holes symmetrically:
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Material thickness around the hole remains more uniform
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Local stress concentrations are reduced
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Structural continuity of the bead is improved
The result is a significantly lower risk of crack initiation in this critical area, particularly under repeated impact loading.
In line with the core values of TMWORKS
The development of this new generation TM5 rim aligns seamlessly with the core values of TMWORKS. Within every development process, quality, reliability, and demonstrable performance are key, with the ultimate goal of delivering maximum value to the customer.
By investing in advanced testing methods and continuously optimizing materials and design, a product is created that is not only lighter and stronger, but also performs consistently under both realistic and extreme conditions. This approach reflects the belief that sustainable product development begins with engineering decisions that directly enhance the experience and confidence of the end user.
Conclusion: measurable performance translated into user value
The latest iteration of the TM5 rim demonstrates that focused engineering leads to tangible and relevant improvements. With a weight reduction of 50 grams and validated impact resistance up to 130J—well above common standards—this rim offers a clear performance advantage.
More importantly, these improvements directly contribute to reliability, durability, and user confidence.
This development represents not only a technical step forward, but also a confirmation of the TMWORKS philosophy: developing high-quality products in which performance and long-term user value are central. This iteration lays a solid foundation for further innovation within the TMWORKS platform.