Guide to Assembling a Complete BMX in the UK

Upon purchasing a complete BMX bike, the majority of its components come pre-assembled. However, for ease of packaging, the handlebars, pedals, and front wheel often arrive detached.

Assembling your complete BMX bike is straightforward when you adhere to the instructions in the video in addition to following the guidance detailed below. Your complete BMX will be ready incredibly swiftly!

Putting your bike together provides an opportunity to thoroughly acquaint yourself with it. For a devoted BMX enthusiast, there’s no greater satisfaction than tending to your new bike with care before embarking on the first ride.

Necessary Tools for Assembling a Complete BMX Bike

Just a handful of tools are needed to kick-start the process.

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

Explore our range of BMX Tools - We’ve got what you need!

A Step-by-Step Guide - Unboxing and Assembling a Complete BMX

Begin by removing all packaging materials such as plastic and foam, and make sure everything intended is inside the box.

First segment of the assembly

Apply grease to the pedal bolts.
Differentiate between the left and right pedals.
Rotate the right pedal clockwise and secure it with a spanner.
Rotate the left pedal anticlockwise and tighten it thoroughly with a spanner.
Loosen the bolts of the stem.
Detach the faceplate of the stem.
Grease the bolts of the stem.
Install the handlebar.
Position the faceplate on the stem, ensuring the knurled part of the handlebar is centralised in the stem.
Secure the stem bolts in a cross pattern - there’s no need to fully fasten the faceplate at this stage.
Loosen the top cap/compression bolt using an Allen key.
Align the handlebars with the fork.

Next, prepare to attach the front wheel:

Loosen the front axle nuts nearly all the way to accommodate the fork dropouts.
Begin tightening the nuts with your fingers.
Use a spanner to ensure the nuts are fully tightened.
Insert the BMX seat into the seat tube, consider greasing the interior of the clamping zone for easier future seat post removal.
Secure the seat clamp with an Allen key.

After the seat is fixed, refine the handlebars and fork alignment whilst seated on the bike. This simplifies making precise adjustments:

Position the bar in line with the fork - use the front wheel as a reference point.
Tighten the top cap/compression bolt using an Allen key.
Finalise tightening the stem in a cross pattern, ensuring alternating bolts diagonally undergo tightening.
Check for an even gap between the stem faceplate and the stem itself - it’s crucial to have an even tightening of the faceplate.

Before setting off for your ride, verify a few final aspects:

Inspect the chain - it should not move more than 2 centimetres, remedy this by loosening the wheel and pulling it back to properly tension the chain.
Ensure all nuts and bolts are fastened securely.
Inflate the tyres to the recommended pressure (as noted in PSI on the tyre’s sidewall).
Remove the valve cap to attach the pump.
Inflate the tyre and replace the valve cap.
Repeat the process for the other wheel.
You’re now ready to enjoy the ride!

Browse our extensive range of complete BMX Bikes.

If you require more comprehensive directions on installing brakes, refer to: How to Install a BMX Brake.