IKSFA competition rule. Ranking System & Tiers category.
IKSFA ranks are determined by both the number of reps/points achieved AND the kettlebell weight used. Higher ranks (MSIC, MS) are only achievable at heavier kettlebells. The same rep count at a lighter bell earns a lower rank than at a heavier bell. Each KB weight tier has its own column in the ranking tables.
See the interactive comparison on KETTLEBELL MONSTER™ for filterable views and more detail.