Engineered for folding bikes: CNCmachined AL7075 aluminum alloy wheels with a hollow design reduce weight to 47 g per wheel while preserving structural integrity for smooth rolling and easy maneuverability. Lightweight and durable construction: Made from strength AL7075 aluminum with precision rubber tires (not standard commercial orings); 60 mm wheels deliver longlasting performance and reliable resistance for daily commuting and urban cycling. Easy installation and strong compatibility: Equipped with M6 bolts for straightforward mounting onto rear racks or folding bike shelves. The 7 mm thickness guarantees a secure fit without modifications, making these wheels a dependable accessory for cargo racks and folding bike setups. Hollow design advantages: The hollow structure lowers weight and enhances aesthetics, giving a sleek, modern look while maintaining full functionality for rolling and parking stability. Use scenario: Urban commuter upgrading a folding bike for better load handling on a rear rack, enabling light cargo transport without sacrificing ease of use. Use scenario: Daily city errands and groceries, where lightweight wheels on a folding bike improve maneuverability and stability when carrying small items. Use scenario: Travel or transit situations where quick installation on folding bike shelves provides additional payload capacity without adding bulk or complexity.