Precision crafted, beautifully realized by hand. Folding convenience combines with high quality riding.
Tetra started from a simple observation: folding bikes solve urban storage brilliantly but almost always trade away ride quality to do it — tiny wheels, flexy frames, and plastic bumpers instead of real suspension. The answer is a tubular space-frame chassis built around patented folding geometry that preserves both performance and compactness. The Tetra-fold System adds a third hinge in the bridge of the frame, letting the central section fold fully inward in a sequence that begins with the rear wheel swinging forward, the bridge collapsing backward, the triangular linkage slotting into position as the third hinge, and the handlebar dropping down to complete the fold — producing a silhouette roughly half the height of the unfolded bike. Where conventional folders use fixed plastic blocks to absorb bumps, Tetra’s Linkage-Shock System couples a genuine hydraulic shock absorber to the rear wheel so the suspension folds with the bike instead of adding bulk. The tubular space frame itself draws on the natural rigidity of tetrahedron geometry — four triangles forming a triangular pyramid — engineered into a precise hinge arrangement of power-moving parts strong enough to keep the chassis stiff through corners and over rough pavement. The design has earned three international awards (Red Dot, the Chicago Athenaeum Good Design Award, and the European Product Design Award), and the bike is handcrafted in South Korea after years of refinement from concept to a mass-producible model. The result is a folder that rides like a performance bike and folds into a carryable footprint without apology.
