I believe that is a 60 tooth gear driving a 12 tooth gear (5:1) and a 36 tooth gear driving a 12 tooth gear (3:1). If you are using a green motor cartridge (200 rpm) this setup will give you a 15:1 gear ratio or 3000 rpm. This is a great flywheel speed. If you look at other flywheel related topics on the forum, the best flywheel rpms are between 3000 and 4200. Any faster doesn’t have the power needed to shoot the disc and can cause your flywheel motor to overheat faster. A 25:1 gear ratio is 5000 rpm and is most likely too fast and won’t generate enough power to shoot the disc. 15:1 is slower than 25:1 but will work better with a green cartridge. If you have blue motor cartridges, I’d recommend using them but if not, 15:1 ratio is what I would recommend.
There are many topics on the forum that clarify what I just said in a much better way. I’d look into this one if you have any. more questions about flywheel gearing.