GT Speed Series Pro 2021 - BMX Bike
The Speed Series Pro features our Speed Metal tubeset to keep the weight down while maintaining the stiffness wanted to take the hole shot. Equipped with disc brakes for fast stopping after the finish sprint and spec'd to give you the confidence to chase the top step out of the box.
Key Features:
- GT Pro Race Cr-Mo Fork with 1-1/8” Steerer Tube 20mm Dropout
- GT SpeedSeries Elite Race Frame with Speed Metal Tubes
- BB86 Bottom Bracket
Occasionally, without notice, manufacturers change product design and/or specifications.
Frame | GT Speed Series MK7 Elite Race Design, 6061-T6 AL, Alloy Formed and Butted Speed Metal Tubes, AL CNC/Forged Quick Change Disc Dropout SyStem, BB86, Taper 1-1/8" to 1-1/2" Integrated H/T |
Fork | GT BMX Pro Race, 100% Cr-Mo 1 1/8" Steerer, Tapered Legs, 3/8" Dropouts |
Headset | 1-1/8"-1.5" Taper Integrated Design, 45X45 Degree Sealed Bearings |
Stem | Promax Impact Top Load, 53mm |
Bars | GT Speed Cr-Mo 8.375"H x 29"W, 8° Sweep, 4° Up, Taper Cross Bar |
Rear Brake | Promax Hydro Disc Rear, 140mm Rotor (Rear Only) |
Brake Lever | Alloy, 2 Finger |
Speed | 1 |
Rims | Alloy Double Wall, 36h |
Front Hub | GT Speed Series, Alloy CNC Body, Sealed Bearings, 28h, 3/8" Female Allen Bolts |
Rear Hub | GT Speed Series Disc Cassette, Alloy CNC body, 4 Sealed Bearings, 6 Pawl 72point Alloy Shimano Cassette, 36h, 3/8" Female Allen Bolts w/ Alloy Washers |
Spokes | Stainless Steel, 14g |
Front Tyre | Kenda Kompact Pro Race 20 x 1.75" |
Rear Tyre | Kenda Kompact Pro Race 20 x 1.75" |
Seat Post | Integrated |
Saddle | BOX Echelon |
Chainset | GT Forged Alloy 2pc., 175mm Arms, 24mm Hollow/ Cr-Mo Spindle, 44T AL CNC Chain Ring, Alloy Chain Ring Bolts |
Bottom Bracket | Sealed BB86 |
Chain | KMC Z1 Narrow, 3/32" |
Cassette | 16T Cog |
Pedals | GT Low Profile FS Platform Design |
BMX Size guide
Kids BMX Size Chart
Rider Height |
BMX |
||
Feet & Inches |
Centimetres |
Approximate Age |
Wheel Size |
3'7" - 4'0" |
110cm - 122cm |
5 - 7 years |
16" |
4'0" - 4'10" |
122cm - 147cm |
7 - 11 years |
18" |
4'10" - 6'4" |
147cm - 193cm |
11+ years |
20" |
Adult BMX Size chart
20” BMX bikes can be sized on top tube length. A taller rider will suit a longer top tube. Though some riders might wish to experiment with top tube length to suit different riding styles, below is a suggestion.
Rider Height |
Top tube length |
5’0” – 5’5” (152 – 165cm) |
20” – 20.5” |
5’5” – 5’10” (165 – 178cm) |
20.75” |
5’10 – 6’0”+ (178 – 183cm+) |
21”+ |
Cruiser BMX Sizing
BMX Bikes with wheels larger than 24” are known as cruisers and will suit riders taller than 5’0” 152cm.
GT Speed Series Geometry
PRO | XXL | XL | PRO | 24 |
A Seat Tube Length | 9.1 | 9.1 | 9.1 | 10.6 |
C Top Tube Actual | 21.75 | 21.25 | 20.75 | 21.75 |
D Head Tube Angle | 74.0° | 74.0° | 74.0° | 73.0° |
E Seat Tube Angle | 72.0° | 72.0° | 72.0° | 70.0° |
G Head Tube Length | 5 | 5 | 5 | 5 |
H Wheelbase | 37.9 | 38.5 | 37.9 | 39 |
I Front Center | 24.2 | 23.66 | 23.1 | 23.5 |
J Chain Stay Length | 15.43 | 14.92 | 14.92 | 15.43 |
K BB Drop | -1.5 | -1.5 | -1.5 | o |
L BB Height | 11.3 | 11.5 | 11.5 | 12 |
M Fork Rake | 1.3 | 1.3 | 1.3 | 1.3 |
EXPERT | XL | EXPERT | JR | MICROMINI |
A Seat Tube Length | 8 | 7.9 | 7.9 | 7.6 7.9 |
C Top Tube Actual | 20 | 19.5 | 18.5 | 16 17.5 |
D Head Tube Angle | 73° | 73° | 73° | 72 73.0 |
E Seat Tube Angle | 70° | 70° | 70.0° | 70 70 |
G Head Tube Length | 4 | 4 | 4 | 4 4 |
H Wheelbase | 35.8 | 35.3 | 33.8 | 30.5 32.7 |
I Front Center | 22.4 | 21.7 | 20.66 | 18.1 19.6 |
J Chain Stay Length | 13.62 | 13.62 | 13.19 | 12.13 13.9 |
K BB Drop | -1.5 | -1 | -1 | -1.7 |
L BB Height | 11.5 | 11 | 11.5 | 10.7 11.5 |
M Fork Rake | 1.3 | 1.3 | 1.3 | 1.3 1.3 |
What size frame do I need if I am between sizes? - read here
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