This is a video tutorial in the Sports category where you are going to learn how to install a seat post on your bike. This is pretty easy. But, it's important that you get proper measurements for the inside and the outside diameter of the tube using a caliper. Now find the correct seat post and the seat clamp. Fix the clamp on the tube. Put generous amount of grease on the bottom part of the seat post and on the inside part of the tube and slide the seat post inside the tube. There is a minimum insertion mark on the post. Make sure you insert it at least up to that mark.