Join Date: Nov 2009
Location: Carrollton, Texas
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Flat platform works on rear rack
A few years ago, I was carrying a pack on top of a rear rack. There is one big problem - no matter how the pack is lashed to the rack, it will find a way to shift to one side. I found that a thin plywood platform, the same size as the pack, worked to keep the pack in place. I made several versions from 3/16" ply with 1/2" hardwood rails glued and screwed to the bottom, attached to the rack with zip ties or plastic p-clamps. Later, I made a more permanent version with aluminum sheet and aluminum U-channel rails. I originally used rope to lash the pack to the platform, later used poly strap and plastic buckles with adjuster slots.
The wooden version will not last more than a few months of all-weather riding, but for one trip should be fine.
Be careful to load heavy items as far forward as possible. It doesn't take much weight behind the rear axle to make the front end squirrely.