Build an adjustable bike jump for kids

Step 4 Assemble the adjustable ramp supports

Trigonometry helped me determine the length of the base 2x4s, and the length of the angled jump supports. Basically, the ramp supports form two edges of a triangle, and the 2x4 base forms the third edge (bottom) of the triangle.

The top sides of the triangle are adjustable using the hinges on the front edges, and the hinges connecting the each of the two sides.

The front (right of image) pieces of the 1x4 are 15", and the rear (left of image) are 32".