Riding a stationary bike can keep you fit in the winter when you can't ride outside. You can ride for hours in the comfort of your home, but it can get boring if you don't have anything to do. If you like to read while you ride your stationary bike, you can build a book holder to attach to your bike, then read and get fit at the same time.
Tilt the table-saw blade so that it will cut an angle of 26.6 degrees. Cut one of the 15-inch sides of the plywood at that angle.
Set the stud so the 1-inch side is on the table saw. Cut it in half, down the length of the stud so that you end up with two triangular pieces, each 15 inches in length. With the saw blade at 26.6 degrees, it will cut the stud diagonally down the middle.
Place the plywood on your working surface so the side that is an inch or so longer is facing up. Place a triangular stud along the edge of the plywood with the 26.6-degree corner. The sharpest edge of the triangular studs should touch the edge of the plywood. The 90-degree-angle corner should be in the air.
Drive a screw about 1 inch from the side of the angled stud and about 2/3 of the way towards the 90-degree-angle corner. Drive your second screw 2 inches from the first screw and 1/3 of the way to the 90-degree angle. Continue driving screws into the angled stud every 2 inches until you have covered all 15 inches.
Turn the plywood over. Screw the other angled stud into the plywood on the opposite side of the board. Place the smallest angle toward the cut surface of the plywood, but this time put the 90-degree angle on the plywood.
Turn the book holder back over. Place the surface of the plywood that you cut to 26.6 degrees against the middle of the handlebars. Hold it so that the cut edge is vertical and the plywood is angled up. Clamp the book holder to the handlebars using the two C-clamps at either side. Each C-clamp should be about an inch from the side.
You can also use a mitre saw to cut the angles. Mitre saws can be adjusted to cut angles as well.
Be very careful not to cut yourself when cutting the wood.