I just got my bike engine kit in today (66cc), and I when I started assembling the back wheel, the bolts are not able to fit through straight, and this makes it impossible for me to get everything all tightened up. I was watching a video from BikeBerry, and I noticed that they had a sprocket that had "chicago-style" bolt holes for the screws, and I was wondering where I could buy one of those. I can give dimensions if needed.