1. quality materials: The aluminum alloy is weatherproof and lightweight, sturdy and durable, resistant to weather conditions, and does not rust. The product is protected from rust with advanced paint technology, ensuring it remains like . 2. Maximum load: to hold 25 kg (main load when installed via a beam on the seat post). In reality, it can support over 50 kg, but carrying adults/people is not recommended for safety reasons. 3. Features: The rear bike pannier rack itself weighs only 1.3 kg (2.86 lbs), making it portable and lightweight, yet capable of holding up to 25 kg (maximum capacity). Dimensions: 35.5 cm in length and 14.5 cm in width. Adjustable to fit various bicycle types. Easy to assemble. Suitable for bicycles with a seat post diameter under 33 mm. 4. Wide application: Portable and durable, ideal for carrying bags, backpacks, and baskets during trips. Compatible with Vbrake and disc brake systems. This bike pannier rack is adjustable and suitable for many bicycle types, including road bikes, mountain bikes, etc.