i always used 22-18 on my zebdi, got me lots of power and speed into the semi taps i do. but it seems like a failry hard gear now that ive gotten into other moves, my wheel comes off skinny things when gapping before i can put much power into it. i got me a 19t cog to use on my new frame, but looks like i'll be having to get a 20 as well, just to see what its like. i havent ridden my bike yet, still not finished. to those that use easy-ish gears, 20-18 and 22-21, is that the gear youre always on for big moves and taps, to tech natural and stuff, or do you shift every now and then?