Guide to Assembling a Complete BMX

Purchasing a complete BMX bike means most components are pre-assembled. However, to fit the box efficiently, the handlebars, pedals, and front wheel are detached.

Following the guidance in the video along with the instructions below ensures that assembling your complete BMX bike is straightforward. Soon, your new complete BMX will be ready to go!

Building the bike provides an excellent opportunity to familiarise yourself with it. As an enthusiastic BMX rider, there's nothing like giving your new bike some tender loving care before your first outing.

Necessary Tools for Assembling a Complete BMX Bike

Only a handful of tools are required to begin.

Allen keys
Wrenches
15 mm open-ended wrench for pedals
Air pump

Explore our range of BMX Tools - everything you require is available!

Step-by-Step Instructions: Unboxing and Assembly of a Complete BMX

Begin by removing all packaging materials, ensuring every part is included.

Starting with the assembly:

Apply grease to the pedal bolts.
Determine which pedals are left and right.
Fasten the right pedal by turning it clockwise, securing it with a wrench.
Fasten the left pedal by turning it counterclockwise, completely securing it with a wrench.
Loosen the bolts on the stem.
Detach the faceplate from the stem.
Add grease to the stem bolts.
Fit the handlebar.
Position the faceplate over the stem, centring the knurled section of the handlebar within the stem.
Tighten the stem bolts in a crisscross pattern—initially, there’s no need to fully tighten the faceplate.
Loosen the top cap/compression bolt using an Allen key.
Align the handlebars with the fork.

Now you can attach the front wheel:

Loosen the nuts on the front axle almost entirely to make room for the fork dropouts.
Screw the nuts with your fingers until snug.
Fully tighten the nuts using a wrench.
Insert the BMX seat into the seat tube; you might want to grease the clamp area to ease future seat post adjustments.
Secure the seat clamp with an Allen key.

After fitting the seat, adjust the handlebars and fork alignment while seated. This allows for precise adjustments:

Align the handlebar with the fork, using the front wheel as a guide.
Tighten the top cap/compression bolt using an Allen key.
Finish securing the stem in a crisscross pattern, ensuring you always tighten the bolt diagonally opposite the one just tightened.
Ensure a uniform gap between the stem faceplate and stem—it's crucial to tighten the faceplate evenly.

Check a few last things before heading out:

Inspect the chain—if it moves more than 2 centimetres, it’s overly loose; adjust by loosening the wheel then pulling it backwards to tension the chain correctly.
Verify all nuts and bolts are firmly tightened.
Inflate the tyres to the suggested pressure (PSI number located on the tyre's sidewall).
Remove the valve cap and attach the pump.
Inflate the tyre and replace the valve cap.
Repeat the process for the other wheel.
You're set to go!

Check out our comprehensive selection of complete BMX Bikes.

For detailed brake installation guidance, refer to: How to Mount a BMX Brake.