If you follow these instructions you show be bike fishing in no time.
1 - 2' x 1 1/2" PVC
2 - #4 Conduit Hangers
2 - Screw on Expanding Quick Caps(for 1 1/2" PVC)
2 - Rubber End Caps to fit 1 1/2" PVC
3 - 1/4"-20 x 1/2" Machine screws and nuts
1 - 10" inches or so of Flat Plate
1 - Schwinn Seat-Post Mount Rack
Step 1: Cut the PVC
Step 2: Prep the End-Caps
Step 3: Mount Conduit Hangers to Rack
Mark the PVC and put aside. I cut a piece of the flat plate so that it had 5 holes. the two holes on each end matched up with the license plate holder on the Schwinn rack. I put a machine screw through the conduit hanger, the outside hole on the flat plate piece, and the hole in the license plate holder, and then screwed on the nut. Do the same thing on the other side. You can tighten the nuts down pretty tight, once the PVC is in there you can adjust the angles.
Put the first PVC piece with the end-cap on top in the conduit hanger and tighten. Make sure you reference the mark you made earlier when you were checking for tire clearance.
Step 4: Attach End-Plugs and Bracket
I cut a piece of flat plate with 4 holes in it. I put a bend in the middle, nothing crazy, just enough to allow full insertion into the PVC. Unscrew the End-Plug wing nut and insert the piece of flat plate. Do the same thing for the other side.
Insert the plugs into the PVC through the bottom. Tighten the wing nuts until SNUG.
Now you can drop those scrap rubber piece into the hod holder. This will protect the end of your rod should it be that long.
Step 5: Discover That Your License Plate Holder Slides Out
So I tried and tried to come up with a quick solution using some of the scrap materials I had, but nothing beat the efficiency of a bungee strap.
Step 6: Mount Up and Ride Out!
I put my rods in to show how it looks.