How to Build a Complete BMX Bike

Prepare the forks so you can slide them into the frame. Take an old pair of shoes and place the bottom two ends of the fork inside the shoes; this will prevent any damage to the forks when you hammer in the bearing race and headset. Slide the bearing race and headset onto the top part of the forks. Slide an old headset over the new one, and hammer the old headset evenly around the new one until the headset and bearing race are in place; doing so will prevent any damage to your new bearings and headset.

Attach the forks. Grease the bearings and the slots in the frame for the forks to prevent the metal forks from scraping the metal frame. Slide the forks through the frame. Put the top bearings over the forks and onto the frame to secure the forks to the frame. Slide the top cap over the frame, put on a spacer and then put on the top gyro plate. The forks should now be secured to the bike frame.

Attach the stem and handlebars. Loosen the Allen bolts on the stem and take off the front plate. Slide the handlebars into the stem and tightly attach the front plate. Attach the stem to the bike frame by pushing it into place. Grease the main stem bolt and attach it to the stem.

Attach the seat and micro-adjustable seat post; use a micro-adjustable seat post because it is much easier to work with than a traditional seat post. Put grease inside the seat tube and put the seat clamp over the frame. Slide the seat post into the bike frame and tighten down the bolt. Then place the seat onto the seat post.

Attach the cranks and pedals. Lift up the bike frame and place it down so that it is standing on the seat. Grease both sides of the bike frame. Using caution, hammer the crank bearing into the frame, and then insert a crank spacer on top of the crank bearing through the frame. Slide the bearings and washer onto the other side, and tighten the bolt.

Hold one end of the bearings with the vice-grip wrench, and tighten the other end of the bearings with a regular wrench. You may have to move around the bearing press to make it fit inside the frame; it does not matter which side of the bearing press goes into the frame first. Tighten the bearings to the greatest extent possible.

Attach the sprocket to the crank arm, but keep it loose. Slide the other crank piece through the frame, slide on a crank spacer and slide it through the bearing press. Take a hammer and hit the outside part of the crank arm to get it all the way through the bearing press inside the frame. Now you should have one crank successfully attached to the frame.

Put a crank spacer on the other side of the crank; the other side of the crank should be visibly coming out of the crank press. Line up the crank arms evenly, and slide a bolt through the hole in the crank arm. Tighten the bolt on the sprocket, and make sure that neither of the crank arms is grinding against the frame of the bike.

Grease the crank arm hole where the pedals go in, and attach the pedal by using either an Allen key or wrench, and repeat on the gyro side of the pedal.

Put the front wheel in first; do not fully tighten it. Make sure the wheel is centered with the front fork. When it's centered, put the back wheel in the frame. Get the bike chain and put it over the back sprocket; do not put it over the front sprocket yet. Attach the master link to the chain. Then attach the chain plate and put it over the master link and attach the chain clip. Pull the chain over the front sprocket. Put the back wheel into the frame and secure it.

Adjust the handle bars to your liking. Tighten all the stem bolts as well as the top bolt in the head set. Check to see if the stem, frame and front wheel are all aligned. Enjoy your BMX bike.