Specification Brand : ROCKBROS BulletPoint1 : ADJUSTABLE STRUCTURE: The adjustable structure allows you to adjust your bicycle rear rack as needed. Assembled with screws, the seat plate can be adjusted by 3.15in/8cm in front and back. The support rod can be adjusted from 13.58in to 17.91in. Suitable for most bicycles, such as 26 "-29" mountain bikes. BulletPoint2 : QUICK RELEASE: Both the main beam and the support rod feature a quick-release design, allowing installation without the need for holes. The bicycle's rear bracket forms a sturdy and stable triangular system, ensuring greater stability, pressure resistance, and preventing deformation and swaying. BulletPoint3 : SOLID & STURDY:The bicycle cargo rack is crafted from high-quality, high-strength aluminum alloy, combining lightweight construction with robust durability. (Recommended Load: 55 lbs).The U-shaped bars effectively prevent pannier from hitting the tires, ensuring the security of your belongings. BulletPoint4 : DESIGNED WITH FENDER:The mudguard can be installed in both the front and rear 4 hole positions, allowing for a 320° range of vertical adjustment. For added convenience, you have the option to install just the mudguards without the bike rear rack, providing you with versatile choices for your outings. BulletPoint5 : NOTE: Fit for Seat Post Diameter≤3.2cm(1.26").Seat Stay length≤3cm(1.18in).Seat Stay Width≤3cm(1.18in). Not fit for rear suspension bike, flat tire bike, soft-tailed bike, carbon fiber bike, folding bike and special seat stay. We provide a one-year warranty, and if you have any quality or installation issues, please feel free to contact us at any time.Please refer to the installation video and steps for this product on Amazon. Color : Black Department : unisex-adult ExternallyAssignedProductIdentifier1 : 682141910594 ExternallyAssignedProductIdentifier2 : 0682141910594 GpsrSafetyAttestation : 1 ImportDesignation : Imported IncludedComponents : 1.Rack Body 2.Main mast 3.Main mast-tail light connection piece 4.Main mast-Seatpost clamp connection piece 5.Quick release seat clamp 6.Fender 7.Support rod*2 8.U-shape Guardrall*2 9.Installation accessories: ItemName : ROCKBROS Rear Bike Rack Bike Rear Rack Bike Cargo Rack for Back Quick Release Adjustable Bicycle Luggage Cargo Rack Fit for 26”-29”Mountain Bike ItemPackageDimensions_Height : 44.9072 centimeters ItemPackageDimensions_Length : 11.7094 centimeters ItemPackageDimensions_Width : 26.3906 centimeters ItemPackageQuantity : 6 ItemTypeKeyword : bike-racks LoadCapacity : 55 pounds Manufacturer : ROCKBROS Material : Aluminum ModelName : bike rack ModelNumber : 33210006001 MountingType : Rear Seat Mount MountingType1 : Handlebar Mount MountingType2 : Frame Mount NumberOfBoxes : 1 Orientation : Rear PartNumber : 33210006001 ProductDescription : Brand :ROCKBROS Color:Black Material:Aluminum alloy+ABS seat plate+PP mudguard Product load: 25KG standard load Fit for:26 "-29" mountain bikes Fit size:Fit for Seat Post Diameter≤3.2cm(1.26").Seat Stay length≤3cm(1.18in).Seat Stay Width≤3cm(1.18in) Compatibility: Can be used with panniers, backpacks, baskets Warranty period: 1 year Package Dimensions : 44*11*24.5cm/ 17.32*4.33*9.65inch Item Weight:1700g /3.75lb