I have two bikes with very similar frames, a FEC Hudson 19.5 and an FEC turbo 18.8. Both have Alienation rims, FEC free coaster, Autum zero forks and MOC ten inch bars. The Turbo has 1.6 tires and the Hudson 1.75 tires but the bikes have very similar parts and the main difference is top tube length. I am noticing that megaspin and g turns are easier with the Turbo (shorter top tube) and basic rolling tricks like fork glides and cyclones are more comfortable with the longer top tube. Also, scuffing is easier on the longer top tube but not sure if that is due to wider tires...I'm interested to hear since most of you have been riding way longer than me and do much more advanced tricks, if you've noticed what type of frame geo is more favorable for certain tricks? What frame geo is a necessity for you?