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BMX bike models are all slightly different, and will require different tools depending on the style and manufacturer. Some of the tools you many need to assemble your bike include:  A three-eighths inch (9.525mm) socket with wrench extension Sockets in 19mm (three-quarter inch), 17mm (0.686-0.669/eleven-sixteenths inch) 15mm (0.591-0.625/five-eighths inch) Allen wrenches in 4mm (0.15748 inch), 5mm (0.19685 inch), 6mm (0.23622 inch), 8mm (0.31496 inch)  Open-end wrench in 15mm (0.591 inch) or an adjustable wrench Wire cutters or scissors Grease Phillips and flat-blade screwdriver Box cutter or knife Air pump Hammer and rubber mallet PVC pipe or old headset cup Using the box cutter or knife, carefully cut the tape or cut the box. Remove all the parts from the box. Cut any zip ties that may be fastening parts together, and remove foam or cardboard that’s wrapped around parts. Lay the parts out on a flat surface so that you can see each one. Use the instructions as a reference if you are assembling a new bike. Inspect the parts for damage. While most bikes have the same basic components, different manufacturers will ship their bikes in different stages of assembly. Depending on how much pre-assembly has been done, your parts may include the:  Bike frame Saddle (the seat) and seat post Handlebars and grips Front fork (the Y-shaped part that attaches to the front wheels and handlebars) Front brakes, rear brakes, and cables Reflectors Front and rear wheel assemblies and tires Chain Peddles Additional box or bag of small parts and hardware Most BMX bikes come pre-assembled with the back wheel and front forks already attached to the frame. If you just bought your bike and are assembling it for the first time, skip forward to the appropriate section depending on how much pre-assembly has already been done on your bike.
Assemble your tools. Remove the bike from the box. Ensure all your parts are there. Determine what assembly is required.