The bike frame and size are the most important deciding factors of what parts are needed to make a custom BMX bike; other parts include fork, headset, stems, bars, grips, seat, seatpost, crankset, BB kit, sprocket, chain, pedals, rims, spokes, hubs and tires. BMX bike parts can be custom-ordered, individually replaced and built to a specific weight, size, color and style. Building a custom bike often takes more time and money than purchasing a premade bike, but it can be personalized for the desired bike and riding style.
The first aspect of building and buying bike parts for a custom BMX bike is to decide upon the bike's style and size — the frame and handle bars are the two main determining components. The frame has three main geometrical points: the top tube length, the chain length and the head tube angle. The handle bars can have an upsweep, backsweep, end-to-end width and width from bend to bend. The best way to decide on specific needs is to ask questions and try parts before buying, according to BMX Direct. Shorter frames are recommended for street bikes and longer for trail riding.
Once the bike specifications and riding style are determined, other parts such as stand over height and tube angles can be decided, ordered or built to custom specifications.