One thing i want to share, since i did the same before as @
Nikolay somehow - chasing after the biggest possible tire on a folder. Keep an eye on bottom bracket height. I ended up at 33cm on my FSIR Spin5.1 with 37-451, you might end up even higher and you feel that something is wrong. I realized it before i went for more with OS20 rubber - there was space left. Maybe it is to fit also 23-406 tires in the same frame and still have the min. ground clearance. If you have experience with BMX tire material, you also know the limitations such as missing rain skills, puncture protection and rolling resistance at comfortable pressure.