SB-MN (Men'she nesushchye - reduced area) or MMN (Modifikatsiya men'she nesushchye) - second generation level bomber powered by 783 kW (1,050 hp) M-105 engines and with new wings with NACA 22 high lift airfoils, reduced wing area and span (18.0 m (59 ft 0¾ in).
SBB-1 - Archangelskii's last iteration of the SB, based on SB-MN and -RK, with even smaller wings (16.0 m (52 ft 5⅞ in) span) twin tail and other changes.