Step 1: Lay Out Base.
To make a rack that can park bikes on both sides attach three cross members across two base pieces. We used skis (185cm)for the base pieces and 32" treated 2x2's for the cross members.
Place the center cross member in the middle of the skis or other base pieces. Position the other cross members 14 1/2" from the center cross member.
Drill countersunk screw holes on the bottom of the skis or other base where the cross members attach. If you use skis, scuff up the slick tops where the cross members are screwed and glued. We used Elmer's polyurethane glue and decking screws.