The Mona six and Monastella were both fitted with a 12x45 Bibendum tyre.
Renault's small family car had a very compact 6-cylinder engine (hence the "Six" in its name - which Renault later referred to using "Stella"). This engine was a bit too small for the size of cr, and it was underpowered. Well known as a Paris taxi for may years. The Monastella was an upgraded version with better trim, and initially the traditional rear-mounted radiator and wind-cutter Renault nose.
The Monasix was replaced by the Monaquatre, and the Monastella by the Primastella.