The kit included the mounting bars that attach to the back tire studs. Pictures did not include the bars and when I did the online chat I specifically asked the question. I was told the kit did not include them, so I purchased the bars. When the kit arrived, I had an extra set. Luckily I did buy them, because the bars were about an inch too short to mount the kit on my 26” cruiser ( Sun Boardwalk). I had modify one set by cutting the extra set down and mounting them together to provide an extension. Additionally, the drive housing was much wider than the studs which made the bars angle to much to provide a good grasp. So, I used my vise to make an S bend in the bars to align correctly. Also, shims for the locking clasp on main housing are too wide, or the bolts too small to make a good connection with the adjusting screws. Replaced shim on engine with multiple stacked washers. Aside from those aspects, the kit was relatively easy to attach and adjust. It is paired with a 39cc four stroke and propels the bike along at a very fast pedal pace. The friction drive does seem to eat up some rubber which is to be expected.