What seathight should i have.
I want to become good at both flat and trial My seat is now about 1-3cm above my knees i like it for trial but i’ve heard that it’s easyer to do long combos and stuff with higher seat.
Above your knees how? Like when standing next to the unicycle? Basically keep it low but not too low. Low enough to get the seat in and out easily, but not so low that your knees keep getting messed up/sore/tired. An exact height, which someone else may offer you, is probably not as useful as experimenting for yourself. Watch videos of expert riders and look at their seat height/leg angles.
Like tire pressure, there is no “correct” numerical answer.