To ensure safety and interoperability, this document gives: the limits for in-service and off-vehicle wheelsets; the operations to be carried out for which the specific values (and/or criteria) remain to be defined in the maintenance plan. This document applies to wheelsets and axle boxes complying with the following European standards: EN 13103-1:2017; EN 13260:2020, EN 13261:2020, EN 13262:2020; EN 13979-1:2020; EN 13715:2020; EN 13749:2021 that comprise: the axle fitted with wheels of diameters greater than or equal to 330 mm; axle boxes with bearings and grease. This document is also applicable to wheelsets: fitted with brake discs, final drive, transmission or noise-damping systems, as appropriate; not complying with the above European standards, but complying with the international requirements in force, for example in UIC leaflets, before the approval of these standards; with tyred wheels; with resilient wheels. For equipment not covered by Directive 2016/797/EC, this European Standard may be applied, noting that different values may be used. All dimensions in this document are in millimetres (mm). It is necessary to describe in a specific document the tasks to be performed in order to maintain wheelsets within the limits defined therein. NOTE The specific values and criteria are defined in an appropriate maintenance plan.