Plug-in foot supports or cargo decks for Xtracycle FreeRadical Cargo Bike Kit or other Xtracycle longtail bikes.
U-Tubes insert into the horizontal ports, and are stronger and lighter than Xtracycle Running Boards.
U-Tubes are sold as a pair and will only fit the Xtracycle Leap.
They also have great weather resistance, as they are made out of aluminum letting them shrug off the effects of sun, rain, and muddy boots. Speaking of mud, the twin tubes support feet but let debris or water fall through.
U-Tubes have the same carrying capacity as the Xtracycle WideLoader Rack but sit about 4.5 inches narrower per side allowing you to snake through tight spaces. A clipped front corner improves foot clearance. They work great for smaller, dense cargo, like lead-acid batteries, bricks, and buckets of paint.