The best tyre fitment for the Rosalie models would be 130/140x40 for the 8CV version, and 150/160x40 for the more poewerful 10CV and 15CV vehicles. Although different tyre sies were fitted for differnt international markets.
The Rosalie replaced the C4 and C6 models to become Citroen's main range in the 1930s. available with a range of engine sizes (even a diesel!) and bodies, these cars were a move upmarket for Citroen, at the same time as a consolidation of manufacturing technology to lower costs. It's over-shadowed by its replacement, the Traction.