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Speed Series Pro XL

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.


+     BOX Pro Carbon 20mm Fork
+     2-pc Hollow Forged Crank Arms
+     Promax Impact Top Loaded Stem


Sizes: 20" wheel / 21.0" top tube
Frame: GT Speed Series Race, 6061-T6 Hydro Formed and Butted Speed Metal Tubes, Integrated QR Clamp, Quick Change Dropout System, BB30, Taper 1-1/8" to 1-1/2" Integrated H/T
Fork: BOX Pro Carbon 20mm Fork
Chain: KMC Z610HX
Crankset Chainwheel: 15
Crank: GT Hollow Forged Alloy 2-Piece, 180mm Arms, 30mm Hallow Alloy Spindle, 44T AL CNC Chain Ring
Crank Option 1: GT Hollow Forged Alloy 2-Piece, 180mm Arms, 30mm Hallow Alloy Spindle, 44T AL CNC Chain Ring
Bottom Bracket: BB30 Sealed
Pedals: GT Low Profile Platform
Rims: Speed Series Aero Double Wall, 36 Hole (F/R)
Tires: Tioga Power Band 20" x 1.85" (F), Tioga Power Block 20"x 1.75" (R)
Hubs: GT Speed Series, Alloy, 36H (F) Sealed Bearing w/ 20mm AL thru axle, (R) Sealed Bearing Shimano Cassette
Spokes: 15G
Nipples: Aluminum
Brake: Promax Cold Forged AL V-Brake w/ Two-Tone brake pads
Brake Levers: Promax V-Point Click Lever AL 2 Finger Lever W/ Reach Adjust
Handlebar: GT Speed Cr-Mo 8.375"H x 29"W, 8? Back, 4? Up, Taper Cross Bar
Stem: Promax Impact Top Load, 53mm Length
Grips: GT Statement Double Lock-on Grips
Headset: 1-1/8"-1.5" Taper Integrated, 45x45 Degree Sealed Bearings
Saddle: BOX Echelon
Seat Post: AL integrated w/ Saddle, 27.2 x 135mm
Seat Clamp: GT Quick Release Integrated Internal Wedge
Extras: N/A

*All prices and specifications subject to change without notice.
Chassis Tune
  • Easy

    Get on it. Ride it. Don’t think twice about it.

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  • Stiff

    Drop the hammer without dropping power. Less flex. Less waste.

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  • Strong

    Ride on, over or through anything you want. You may not survive, but your bike will.

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  • Light

    So you can go faster and jump higher. It’s not rocket science.

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Speed Series Pro XL Geometry

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