1. Loosen the Payback clamp
Loosen the Payback clamp at the bottom of the seat post.
You should be able to move the seatpost up and down freely.
Be careful that you don’t unscrew the clamp too far. The internal bolt may fall out. If it does, you'll need to re-insert it.
2. Adjusting the saddle height
Stand to the side of your bike and face forward.
Rest the saddle of your bike against your side.
Adjust the saddle so that it is even with your hip. This is a good estimate of how high your saddle should be.
When your bike is ready to ride, feel free to adjust your saddle up or down as necessary.
3. Tighten the seatpost clamp
Line up your saddle so that it is straight, pointed directly at the front of your bike.
Tighten the Payback seatpost clamp
4. Make sure the saddle is secure
Attempt to rotate your saddle left and right.
If it is loose, tighten the Payback seatpost clamp.
Attempt to rotate your saddle fore and aft.
If it is loose, tighten the saddle bolt on the underside of the saddle.