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Description. The iScooter U4 Rear Rack Basket design features an aluminum build that allows you to store up to 143 lbs making it a breeze to load groceries, equipment, or deliveries.. Features. Black finish. Recommended use: Daily Necessities/Tools/Food/Appliances. Specs. Weight limit: 143lbs. Dimensions: L400mm - W367mm - H220mm. Material of 6061 Aluminum. Compatibility. Compatible with iScooter U4 electric bikes only