Until 1979, both 105 and 120 were equipped with 14" wheels, with 155 SR 14 tyres, just like its predecessors, S100 and 1000 MB, but since 1979, due to an increased gauge, both models were given 13" wheels with 165 SR 13 tyres for 105 S/L/GL and 120L/LS versions, and GLS versions were equipped with 175/70 R13. This update was made in order to improve road handling, stability, performances and fuel consumption.
