In the international standard classification, peak gap involves: .
GM Europe, peak gap
GME17009-2013 Porosities and Surface-Discontinuities Forks Shift / Transmission M1x Porosit鋞en und Oberfl鋍hen-Fehlstellen Schaltgabeln / Getriebe M1x Issue 1; English/German; Includes Appendix A and B