Park / Dirt
Browse used park and dirt BMX frames for sale from riders across the UK. These are 20in chromoly frames built for ramps, concrete and jump lines, usually 20.5in to 21.25in in top tube length with chainstays between 12.8in and 13.6in and a mid or Spanish bottom bracket shell. Most sellers here are moving on a frame after a geometry change, or replacing one that has cracked.
What is the difference between a park frame and a dirt frame?
Park frames keep the rear end short, around 12.8in to 13.2in of chainstay, so the front wheel lifts easily out of transitions and the bike turns quickly on a hip. Dirt and trails frames stretch the chainstay towards 13.5in and sit slightly slacker, which holds a line better down a jump run and keeps the landing load off your arms. The S&M ATF and Fit BF lean towards trails, while frames like the Sunday Soundwave and Wethepeople Battleship are cut for street and concrete.
How do park and dirt frames compare with race, freestyle and flatland frames?
Park and dirt sits in the middle of the freestyle range: 4130 chromoly throughout, thick investment-cast dropouts, and clearance for a 2.4in tyre. A race frame is aluminium or carbon, longer in the top tube, drilled for a rear brake and geared around a 40t-plus chainring, which makes it quick out of a gate and wrong on coping. Flatland frames go the other way, with chainstays near 12in and a steep head angle that brings the front wheel back under your feet.
What size BMX frame should I buy?
Top tube length is the measurement that matters, since standover and seat tube barely vary between freestyle frames. Riders under about 5ft 8in generally get on with 20.5in to 20.75in, most adults settle at 20.75in to 21in, and anyone over 6ft tends to want 21.25in or more. Measure the frame you ride now before committing, because the same nominal length feels different behind a 13in rear end than a 13.5in one.
What should I check on a used BMX frame?
Start at the head tube, where cracks open in the weld between downtube, gusset and tube, and treat a single-colour respray over an untidy bead as a question worth asking. Then look for a split running down the seat tube from the clamp slot, elongated dropout slots where a rear wheel has slipped under pressure, and an oval bottom bracket shell mouth after repeated mid bearing presses. Dents in the top tube from bar spins and in the chainstay from chain slap are cosmetic until they crease, but a frame that will not let the rear wheel sit centred is bent and worth nothing.
How much should a used BMX frame cost?
A straight chromoly frame from an established name usually changes hands at roughly half to two-thirds of its new price, and drops further once it has been resprayed or had a gusset added by a welder. New is the better call if you need a specific brake configuration or an uncommon top tube length, since only a fraction of the BMX frames listed at any moment will be in your size. A cheap frame with a cracked weld ends up costing more than a new one once every part has been moved across twice.