At Sour, framebuilding is not a black box.
It’s a controlled, repeatable process where design decisions become physical structure.
Every frame is fabricated and welded in‑house, in our workshop in Saxony. This proximity between design and fabrication is fundamental to how we work. Tube selection, alignment, joint preparation and welding are not separate steps handled in isolation — they are part of a continuous process, informed by both engineering intent and hands‑on experience. Building frames ourselves means we take responsibility not only for how a frame rides, but also for how it is made.
Preparation before precision
Before any weld is laid down, far more work happens quietly.
Tubes are cut, mitered and aligned with care, ensuring accurate fit and consistent geometry. Joint preparation is treated as a structural decision, not a cosmetic one. Alignment is checked repeatedly throughout the process to control tolerances and prevent stress being introduced unintentionally.
Welding is only as good as the preparation that precedes it.
Welding as structure
Our frames are welded with a focus on structural integrity and fatigue resistance rather than visual excess. Heat input is controlled carefully to preserve material properties, especially in highly loaded areas and transitions between tubes.
Rather than aiming for uniformity in appearance, welds are executed to suit their structural role. Different joints carry different loads, and they are treated accordingly. The goal is consistency in performance, not decoration.
Every frame is checked for alignment after welding to ensure geometry and tracking remain true to design.
Repeatability through responsibility
Because design and fabrication happen under one roof, feedback is immediate. If a detail requires adjustment — in tube shaping, joint access or sequencing — it’s addressed at the source.
This allows us to refine processes incrementally without losing control over the outcome. The result is a frame that reflects not just a drawing, but a production method that has been shaped by real use and long‑term experience.
Fabrication is where intent becomes material.
Built by hand, built to last
Handbuilt does not mean improvised.
It means each step is executed with intention, accountability and understanding of how choices affect the finished frame over years of riding. Durability, reliability and predictable behavior remain the guiding principles throughout fabrication.
That’s what framebuilding means to us.
