700x32 will fit the pre 2020 S40 model. I have 700x32 conti S5000 on one set of wheels for road riding and 700x38 Schwalbe G-one on another set for gravel riding.I’ll be curious to see how you like them, and as importantly, whether they’ll fit. On my new S40, there’s so little clearance with the stock tires (700 x 30) that I’ve wondered if any larger tire may result in too large a diameter to fit in the fork.