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Speed Series Junior

Speed Series Junior

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Get your head in the game and your mind on the track with the GT Speed Series BMX bikes and frames. The lightest aluminum race frame on the market features a race-ready geometry and quick-change dropouts so you are prepared for every condition the day throws your way

Additional Information

Sizes XS, S, M, L
Model Code G47208MJR
Frame GT Speed Series MK7 Junior Race Design, 6061-T6 AL, Alloy Formed and Butted Speed Metal Tubes, Reverse Dropouts, Euro BB, 1" Integrated H/T
Fork GT BMX Junior Race, 6061 AL 1" Steerer, 25.4x2.2mm Blades, 315mm A/C, 3/8" Dropouts
Chain KMC Z610
Crank GT Forged Alloy 2-Piece, 135mm Arms, 24mm Hallow Alloy Spindle, 36T AL CNC Chain Ring, AL Chain Ring Bolts
Bottom Bracket EB24 Sealed Bearings
Pedals GT Mini Size Platform, PP Material
Rims Speed Series Aero Double Wall, 28 Hole (F/R)
Wheels Tires (F) Tioga Power Block 20x1-3/8" (R) 20x1-1/8"
Front Hub Front: GT Mohawk, Alloy CNC Body, 28H, Sealed Bearings, 3/8" Female Allen Bolts w/ AL Washers Rear: GT Mohawk Cassette, Alloy CNC body, 28H, 4 Sealed Bearings, 4 pawl Cassette, 3/8" Female Allen Bolts w/ AL Washers
Wheels Spokes 14G
Brakes Rear: Promax MV-87, 85mm Cold Forged AL Arms, Mini V-Type
Rear Brake Rear: Promax MV-87, 85mm Cold Forged AL Arms, Mini V-Type
Brake Levers Promax BL-367 mini V-Type AL 2 Finger Lever w/ Reach Adjust
Handlebar GT Speed Alloy 4"H x 24"W, 8? Back, 2? Up, Taper Cross Bar
Stem GT Top Load, Cold Forged 1", 40mm Length
Grips GT Statement
Headset 1" Integrated Design, 36X45 Degree Sealed Bearings
Saddle BOX Echelon
Seat Post AL integrated w/ Saddle, 22.2 x 135mm
Seat Clamp PROMAX, Aluminum, 25.4mm Single Bolt
Spec Extras GT 6061 AL CNC Chain Tensioners


Bike Geometry