​This is a 10 speed bicycle that I have constructed over time. It is very detailed and believe it or not, I didn't use a single reference image. I really didnt need to since I spent so much time with them in younger days. On this model you can spin the crank, it will turn the back wheel, and the chain also moves. If you haven't noticed, I love green! The challenge to this model is to have the chain move because the crank was rotated, but I haven't been able to find a way to do that yet. If it's even possible.