This gave more room for primary fuel tank and avionics. In the Soviet Union the type was given designation MiG-29S, but in practice there were very few changes as compared to the basic version. In production numbers the S-variant did not exceed 50 and from the user's point of view, it hardly differs from the basic version. The final series featured new nose wheel and pitot tube projection. Internal fuel capacity 3,200 kg, auxiliary fuselage tank volume 1,184 kg.
All aircraft have hydro-mechanic control system and covered air intakes.
The power plants are two RD-33 engines, which provide the thrust of 8,300 kp with afterburner. The maximum take-off weight is about 16,800 kg. The three-axis IR rangefinder is mounted inside a transparent dome on top of the nose forward of the cockpit and it comprises the directional laser rangefinder. Detection range to fighter targets is approximately 70 km in encounter situations and about 35 km in pursuit. The detection range to bomber targets is estimated to be double that to fighters.