Colony Premise 20 Inch BikeColony Premise Bike A Premise is a previous statement or proposition from which another is inferred or follows as a conclusion. It is also an epic BMX bike from Colony BMX! To maximise the strength throughout the entire frame, fork and bars Colony used Full Chromoly Tubing. 9" high, 29. 5" bars are just the right width for stability and are barspin ready! 25 9T gearing gives you the best ratio for street, park and dirt riding and three piece cranks