teräsrunkoinen

Teräsrunkoinen is a Finnish adjective meaning having a steel frame. It is used in technical descriptions and product specifications to indicate that the primary load-bearing skeleton of an object is made of steel. The term can apply to a range of items, from bicycles and machinery to vehicles and structural housings, where the frame or chassis provides the main support.

In practice, teräsrunkoinen is most commonly encountered in discussions of bicycles. A steel-framed bicycle is described as teräsrunkoinen to distinguish it from models with aluminum or carbon fiber frames. Steel frames are generally heavier but valued for durability, reparability, and good fatigue resistance. They are often associated with a traditional ride feel and, in many cases, easier and cheaper repairs after damage. Modern teräsrunkoinen frames may use alloy steels that improve strength and stiffness while maintaining favorable ride characteristics.

Beyond bicycles, the term can appear in manuals and catalogs for industrial equipment, agricultural machinery, and older or specialized vehicles where a steel frame remains the preferred structural solution due to toughness and weldability. Maintenance considerations for teräsrunkoinen constructions include protection against corrosion (such as coatings or paint) and regular inspection for stress, especially in environments with moisture or exposure to chemicals.

Overall, teräsrunkoinen denotes a structural design choice centered on a steel frame, balancing durability and repairability against the weight advantages of other materials.