What is ISO 4209 ‑ 2 about?
ISO 4209 ‑ 2 is an international standard and part two of a multi-series of documents on truck and bus tyres and rims.
ISO 4209 ‑ 2 specifies the designations, contours and dimensions of drop-centre (one-piece) rims for use on trucks and buses. The rim dimensions are those rim contour dimensions necessary for mounting and fitment of the tyre to the rim.