How to Build a BMX Bike

Building a BMX bike from scratch remains a vital piece of knowledge for any avid BMX bike rider. Knowing the working components of the BMX bike allows the rider to perform necessary adjustments and repairs as opposed to having to take the BMX bike to a bike shop. The BMX bike consists of a basic frame with the handlebars, chain, tires, and other accessories added on. Building a BMX bike requires a few common tools.

Things You'll Need

  • Bike frame
  • Bike fork
  • Fork bearing race and headset
  • Fork bearings
  • Hammer
  • Old shoes
  • Old head set cup
  • Bicycle grease
  • Tire spoke
  • Gyro brake set
  • Handlebars and stem
  • Allen wrench
  • Socket wrench
  • Seat and seat post
  • Seat clamp
  • Micro adjuster
  • Sprocket and crank arm
  • Pegs
  • Bike chain and master link
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Instructions

    • 1

      Place each of the two bottom drop outs of the bike fork into an old shoe to protect it during the hammering process. Place the circular bearing race over the top of the bike fork and let it fall to the bottom of the base.

    • 2

      Place an old head set cup on top of the bearing race. Hammer on top of the old head set cup to push the bearing race into place. Squeeze some bike grease onto the tip of the tire spoke. Rub the grease around the circular bearing race at the base of the fork.

    • 3

      Place the bearing over the top of the fork and slide it down on top of the bearing race. Insert the circular vertical tube at the front of the bike frame over the top of the fork.

    • 4

      Slide a bearing over the area of the fork extending out of the bike frame. Place the top cap of the headset on top of the bearing. Loosen the bolts on the handlebar stem with the tip of the Allen wrench. Pull off the front plate of the stem.

    • 5

      Lay the bottom area of the handlebars on top the indented area of the stem. Place the front plate of the stem over the handlebars. Tighten the bolts with the tip of the Allen wrench.

    • 6

      Place the handlebars onto the frame of the bike by inserting the stem through the top of the fork. Tighten the remaining bolt on top of the stem. Place the seat clamp over the middle of the frame. Insert the seat post. Tighten the bolts of the clamp.

    • 7

      Slide the micro-adjuster over the bottom slots of the seat. Tighten the micro-adjuster over the post to secure the seat. Flip the bike upside down. Press one bearing into the side of the horizontal cylinder in the middle of the frame. Insert a bearing spacer and then push another bearing into the opposing side.

    • 8

      Secure the sprocket to the crank arm with the Allen wrench. Slide the middle cylinder through the sprocket and crank arm. Insert a spacer onto the middle cylinder. Insert the middle cylinder through the two bearings in the middle of the frame. Attach the other crank arm on the opposing side of the sprocket. Tighten the crank arm bolts.

    • 9

      Attach the pedals onto the crank arms and tighten the bolts. Align the front wheel onto the front of the frame. Tighten one peg on each side of the wheel to secure it to the frame. Slide the back wheel into the back of the frame.

    • 10

      Wrap the chain around the back sprocket and front sprocket. Connect the chain on the opposing ends of the master link. Attach the back and front plate over the master link. Tighten one peg on each side of the back wheel.