Guidance on Assembling a Complete BMX Bike

Upon purchasing a complete BMX bike, you'll find that most components come pre-assembled. Nevertheless, in order to fit the bike into an appropriately sized box, the handlebars, pedals, and front wheel are detached.

Following the video instructions along with the guidance provided below will simplify the process of assembling your complete BMX bike. You'll have your new ride ready swiftly!

This assembly process allows you to familiarise yourself with your bike. For an enthusiastic BMX cyclist, there’s nothing quite like giving your bike some tender loving care before your inaugural ride.

If you're hesitant about assembling it independently or lack experience with bikes, it's highly advisable to consult a specialised shop.

Which Tools Are Essential for Assembling a Complete BMX Bike?

Quite a minimal array of tools is needed to commence.

Allen keys
Wrenches
Open ended 15 mm wrench for pedals
Air pump

Explore our range of BMX Tools - We've got you covered!

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

Initially, remove all protective materials, ensuring that nothing essential is omitted from the package.

Commencing with assembly

Lubricate the pedal bolts.
Discern between the left and right pedals.
Rotate the right pedal clockwise and secure it using a wrench.
Rotate the left pedal counterclockwise and ensure it is fully secured with a wrench.
Loosen the bolts on the stem.
Detach the faceplate from the stem.
Grease the bolts of the stem.
Fit the handlebar into position.
Attach the faceplate over the stem, confirming that the textured section of the handlebar is centred correctly in the stem.
Tighten the stem bolts in a criss-cross pattern – full tightening of the faceplate is not required at this point.
Loosen the top cap or compression bolt with an Allen key.
Align the handlebars with the fork.

Proceed to mount the front wheel:

Almost fully unscrew the front axle nuts to allow space for the fork dropouts.
Hand-tighten the nuts.
Completely secure the nuts using a wrench.
Insert the BMX seat into the seat tube; you might consider greasing the interior of the clamp area to facilitate easy removal of the seat post in future.
Secure the seat clamp using an Allen key.

Once the seat is properly positioned, adjust the handlebars and fork while seated on the bike to ensure precision:

Align the bar with the fork, using the front wheel as a reference point.
Tighten the compression bolt or top cap with an Allen key.
Finalize stem securing using a cross pattern, meaning you continuously tighten the bolt opposite the one you just adjusted.
Ensure an even gap exists between the faceplate of the stem and the stem itself – it’s crucial that the faceplate is evenly tightened.

Conduct these final checks before setting off:

Inspect the chain – if it exhibits over 2 centimetres of movement, it is too slack. This can be resolved by loosening the wheel and pulling it back until the chain is appropriately taut.
Confirm all nuts and bolts are securely fastened.
Inflate the tyres to the specified pressure (the PSI is listed on the tyre’s sidewall).
Remove the valve cap and attach the pump.
Inflate the tyre and replace the valve cap.
Repeat on the opposite wheel.
You’re now ready to start your journey!

Check out our comprehensive array of complete BMX Bikes.

For more detailed guidance on brake installation, see: How to Install a BMX Brake.