Complete Bikes
Browse used complete BMX bikes for sale from riders across the UK. These are ready-built 20in bikes rather than parts — freestyle, park, dirt, flatland and race, sized by top tube length from about 20.5in for shorter riders to 21.25in and up. It suits anyone who wants to ride straight away rather than assemble a build from a bare frame.
What is a complete BMX?
A complete comes built with wheels, cranks, bars and seat fitted, running a single gear and 20in wheels. Manufacturers spec them in tiers: budget models use high-tensile steel and loose-ball bearings, mid models mix chromoly in the main tubes with a sealed mid bottom bracket, and top completes are full chromoly with a 9t cassette driver and sealed hubs throughout.
Freestyle, race or flatland — which complete do I need?
Freestyle completes are the default for skateparks and street, with 2.3in tyres and peg-ready 14mm axles. Race completes are aluminium, roughly half the weight, and built for a 30-second gate-to-finish sprint. Flatland completes are shorter in the top tube and steeper in the head angle, which makes them twitchy to ride in a straight line.
Should I buy a complete or build from a frame?
A complete is almost always cheaper than the same parts bought separately, so building only pays if you already have wheels and cranks to move across. Buying a bare BMX frame makes sense when you have broken a frame but kept the rest of the bike, or when you want a specific geometry that no complete is sold in.
What wears out first on a used complete BMX?
The stock parts go before the frame does: plastic pedals crack at the pins, the rear rim picks up dents from grinds and hard landings, and the driver pawls in the cassette hub start slipping under a hard pedal stroke. Check the mid bottom bracket bearings for notchiness, look for a stripped or rounded seat clamp bolt, and see whether the gyro cables have frayed where they enter the plates.
What is a fair price for a used complete BMX?
Value tracks the frame material and hub spec more than the badge, so a two-year-old chromoly complete with sealed bearings holds far more than a nearly new high-tensile bike. Bikes that have been stripped of their brakes lose value to buyers who want them back. Buy new if you need a specific top tube length for a growing rider, since sizes come and go quickly on the used market.