United Motocross BMX Bike (2021)



professionally built bmx bikes for sale


  • Long 21" top tube for taller riders
  • Sealed bearings throughout for a more trustworthy ride
  • Loud rear cassette hub
  • Harder 28/9 gearing
  • More stable 'trails' geometry
  • United Indirect tires can handle the dirt!

  • Wow, what a rig! For those needing some extra room, the United Motocross bike is ready for ya. A longer 21" top tube caters to the taller rider, with jump-ready geometry and sealed bearings throughout to make it more durable.

    The United Motocross 2021 bike looks the goods, with United aftermarket rubber to keep you sticking in the dirt - the Motocross even comes with a Bicycle Union top tube pad for extra style points!


    • Toptube Length: 21"
    • Chainstay Length: 13.25"
    • Headtube Angle: 74.5°
    • Seattube Angle: 71°
    • Standover Height: 8.5″
    • Bottom Bracket Height: 11.6"
    • Top Tube Length 21” Frame, Cromo Top Tube, Welded Brake Mounts, Integrated Head Tube, Mid BB, CNC Seat Stay Bridge Embossed Logo Down Tube Gusset
    • Forks: CRMO Steerer Tube, Integrated Bearing Race, Tapered 1020 Hi Tensile Steel Legs
    • Handlebars: 9” X 29” 1020 Hi Tensile Steel, 1° Up Sweep, 12° Back Sweep
    • Grips: United Jimmy Grips & United Bar Ends
    • Headset: United Integrated Sealed Bearing
    • Stem: United 50mm Reach Top Load Stem, Embossed United Logo, Forged Detailing
    • Rear Lever: Alloy
    • Rear Brake: 990
    • Cranks: 3pc 170mm, Tubular CRMO, 8 Spline
    • BB: United Sealed Bearing Mid
    • Sprocket: 28t Steel
    • Pedals: United Supreme PC
    • Chain: X410
    • Rear Rim: Alloy 36h, Single Wall
    • Front Rim: Alloy 36h, Aero, Single Wall
    • Rear Hub: 36h United Supreme Sealed Cassette Hub, 14mm Axle, Sealed Bearing 9t Driver, 4 Pawl, Ultra Loud Mechanism
    • Front Hub: 36h Sealed Bearing, 10mm Female Axle
    • Rear Tire: United Indirect 20 X 2.10”
    • Front Tire: United In-Direct 20 X 2.35”
    • Seat: United Padded Seat/Post Combo
    • Seat Post: Integrated
    • Seat Clamp: Alloy