My junk yard Azuki 58cent frame and parts from the parts box. So far just using center gear of 5 speed free wheel and cut off large chainring. Shortened handlebar 2 1/2 inches each side and used Grip shift grips with front brake only. Rode it yesterday and it was fun, climbed very steep streets fairly easily and brake worked well. I can see the appeal for single speed bikes, I am 61 years old and this is fun.