We're aiming for around 1000 RPM with 5" wheels, then we'll see how well it works and adjust from there. For our planned motor, we have 4:1, 8:1, 16:1 and 64:1 gearboxes on hand, plus a few sprockets to adjust the ratio between those numbers. There's nothing wrong with making a few attempts to see what works and what doesn't! And when you need to figure something out quickly, you can always prototype with a drill
