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BMX Bike Assembly Guide

Bike Assembly

I Bought A Bike Now What?

Thanks for shopping at Shred Shop. We’re stoked you chose to buy your BMX Bike from us. Before we shipped your BMX Bike, our pro assembly techs carefully prepped the bike for shipping. There are a few steps to follow to finish assembling your bike when it arrives. Before we start, you’ll need some tools.

Tools You Need:

  • Box Cutter or scissors
  • Philips head screw driver
  • Metric Allen Wrenches: Generally, 4, 5 and 6mm wrenches will work for what you need.
  • Socket Wrench
  • Pedal Wrench
  • 15mm Wrench: for bolt-on wheels only
  • PolyLube Grease
  • Floor Tire Pump

Bike Anatomy

How To Assembly Your BMX Bike

Step 1: The Un-Boxing

  1. Carefully cut open the bike box with your box cutter or scissors, keep an eye out for staples so you don’t cut yourself or scratch the bike. Try to keep the box intact.
  2. Pull out the bike frame with all the parts attached and set it down.
  3. Start cutting the zip ties holding the handlebars, front tire, and small parts to the bike frame, and carefully remove all protective packaging from the bike.
  4. Stand your bike upright and balance on your fork, or balance it upright using the box. If you have a bike stand, you can use it.
  5. This is when you want to check your bike for any damage during shipping. Our assembly techs package your bike to prevent damage. Sometimes shit happens, we recommend you contact us if there is any major damage so we can walk you through the claim process.

Contact us: Click the Live Chat icon on our website at, call 877-734-7380, or email us at

Step 2: The Seat Post

  1. Loosen, don’t remove, your seatpost clamp located on the frame of your bike.
  2. Lube up. Add a thin layer of grease to the end of your seatpost and the inside of your seatpost clamp and frame.
  3. Slide it in. Your seatpost should slide right into the seatpost clamp and frame opening. If you get stuck you need to loosen the clamp more.
  4. Make sure the seatpost is inserted to at least the minimum height marked on the post.
  5. Make sure your seat is straight by lining up the narrow end of your saddle parallel to the top tube on the frame of your bike.
  6. Begin to tighten your seatpost clamp until the seat no long twists in the clamp. Do not over-tighten your seatpost clamp, it could cause damage to the bike.

Step 3: Handlebars

  1. Locate the stem at the front of your bike and remove the faceplate and bolts.
  2. Take your handlebars and center them in the opening on the stem.
  3. Put the faceplate back on and replace the bolts. Tighten the bolts until the handlebars are snug but can still be adjusted.
  4. Make sure the gaps between the stem and faceplate are even on both sides.
  5. Make sure the handlebars are in line with your fork.
  6. Tighten all the stem bolts in a ‘X’ or cross pattern to ensure it’s evenly tightened and secured in place. Do not over-tighten the bolts, it could damage the stem and handlebars.

Step 4: Installing The Front Wheel

  1. Flip the bike upside down so it’s balanced on the seat and handlebars.
  2. Remove the axle nuts on the front tire and drop it into the dropouts of the fork.
    • Note: Sometimes the fork legs need to be spread apart a little for the axle hardware to fit inside of the dropouts. This will not damage your forks.
  3. Make sure the tire treads are facing the same direction as the rear tire.
  4. Slide the safety washer onto the axles and thread the axle nuts over the washers by hand.
    • Note: The type of safety washer may vary.
  5. Tighten the axle nuts all the way with a wrench, making sure the front tire lines up with the fork crown.

Step 5: Time To Add Air

Normally we fill the tires with only a minimum amount of air so nothing pops because of atmospheric changes during shipping.

  1. Remove the valve cover on your tires. Grab your bike pump and push the pump head onto the open valve, then lock it in place.
  2. Check the sidewall of the tire for the recommended pressure range.
  3. Fill the tires with air to a pressure that feels good within the recommended pressure range.

Step 6: Attaching Your Pedals

  1. Find the pedals in the parts box.
    • Note: Pedals are labeled right or left specifically.
  2. Thread the pedals onto the crank arm by hand. Tighten all the way using a pedal wrench or an Allen key.

Step 7: Final Checks

  1. Spin both wheels to make sure they spin freely and the brakes aren’t catching if your bike is equipped with brakes.
  2. Pump the brakes and make sure they make contact before the brake lever is pulled all the way back.
  3. Stand over your bike and adjust the seatpost to a comfortable height.
  4. Make sure every bolt is tightened correctly.
  5. Test ride your new whip.

Follow the easy to use step by step guide to finish assembling your BMX Bike when it arrives. If you’re not confident in your ability to assemble your bike safely or don’t have the tools, we recommend taking your bike to be reassembled by a qualified local bicycle mechanic.

Contact us if you have any questions by clicking the Live Chat icon on our website at, calling 877-734-7380, or email us at

And remember, you can customize your bike with parts and accessories at Or shop for Skateboard and Snowboard gear! Then sign up to ride for Shred and enjoy the benefits of our Team Rider program!