Max tire width for Specialized Roubaix SL3 pro

Hi all, sorry but another (and very specific) tyre width question. Does anyone know what is or, have personal experience with max tire width for 2012 Specialized Roubaix SL3 Pro (rim brake)? I currently run 30mm Schwable G-One speed on Mavic Ksyrium Elite wheels which leaves me I with circa 4mm of clearance on the back, and even more on the front. I did buy Specialized Roubaix 30/32 tyres but they are a fair bit bigger (wider and taller) and do not fit at all. I’m riding on mostly dry maintained gravel roads with a fair bit loose and corrugated sections in North East Victoria (Australia). I’m happy with the Schwables and actually want to transfer them to another bike and if possible, find something a fraction wider for my Roubaix.
Sorry for the long winded question and thank you for reading. :pray: