This kit allows you to mount a jackshaft to your bicycle frames seat tube. Weld on our custom "U" mount and easily assemble a jackshaft for your bike. The kit is versatile and can be mounted anywhere you wish on your 1" or 1-1/8" seat tube (some filing necessary for a perfect fit). Cut the 5/8" shaft to length and use the included lock collars to prevent side to side movement of the shaft. Combine with our mini hub (p/n 10110) and input sprocket (p/n 10160). Also select an output sprocket in #40/41 chain size (p/n 10150) or in #35 chain size (p/n 16440).