Iv done searching and reading old threads and I’m not sure I found the info I was looking for. Iv got a 421 Serval, +4 swingarm, gearing 3.0 (14-43). I was running 22x11x10 10 paddle. It was too much paddle. Boggy until I reached speed on the dunes. I was running 15-42 gearing on those tires. (Sand was also damp on the particular day I was trying them) Keep in mind, this is a play bike, so I like the 10in wheel look and rollout isn’t my main concern. I would think 20x10x10 9 paddle extremes would work great for my application, but want to verify before I spend the money again. 8 seems too little but I’d like to hear suggestions.