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Manufacturer functional interchange
Superior Gearbox BMQ130 appears in the same manufacturer-published cross-reference row as Hub City 521 at Match installed ratio/application · VarioDrive size 130.
Superior Gearbox publishes BMQ130 (VarioDrive size 130, motor input flange) as a competitor cross-reference target. Superior describes VarioDrive as functionally interchangeable with listed drives while requiring independent verification of ratings, dimensions, fit and application suitability.
The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.
Hub City 521 and Superior Gearbox BMQ130 are tied by the published source at Match installed ratio/application · VarioDrive size 130.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.