The cargo you carry can help influence the rack or racks you choose. Not satisfied with off the shelf rack options, reader Herman got creative with aluminium tubes (in the U.S. we call it aluminum). Take it away Herman . . .
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Custom rear rack made from 1" aluminium tubes and connectors. This is designed to carry my wife and a child.
Commercially available aluminium racks are never straight, are flexy with heavy loads and have low weight capacity. Stainless steel racks are available but very expensive. If PVC parallettes are strong enough to support a person's weight, these 1 inch aluminium tubes should be more than strong enough to do the job.
This is the rack, removed in one piece.
Some close up shots of the rack.
Here is the full bike in action with load.