GT Speed Series Junior 2024 - BMX Bike
Built with a Speed Alloy frame, reverse rear dropouts for quick gear swaps, and double-wall aero rims, this bike provides the perfect balance of agility and power for young BMX riders ready to dominate the track.
Key Features:
- Frame: GT Speed Series MK7 Junior Alloy Frame with reverse dropouts for quick gear changes.
- Fork: GT BMX Junior Race fork with 6061 AL steerer and 3/8” dropouts for durability.
- Drivetrain: GT Forged Alloy 2-piece chainset with 155mm arms and 40T CNC chainring.
- Brakes: Promax MV-87 mini V-type brakes for powerful and reliable stopping.
- Wheels: Speed Series Aero double-wall rims with 28h stainless steel spokes.
- Tyres: Kenda Kompact Pro Race tyres for excellent grip and speed on race tracks.
- Saddle: BOX Echelon saddle with integrated seatpost for lightweight performance.
- Finance Options: Available with 0% APR finance for flexible payments.
The GT Speed Series Junior is purpose-built for young BMX racers, delivering the performance and lightweight build needed to excel on the track. The Speed Alloy frame offers exceptional stiffness and durability, while the reverse dropouts allow for quick and easy sprocket changes, perfect for fine-tuning performance mid-competition.
Equipped with GT Speed Series Aero double-wall rims and Kenda Kompact Pro Race tyres, this bike ensures speed, traction, and durability when it matters most. The Promax MV-87 mini V-brakes provide reliable stopping power, while the cold-forged alloy chainset with a 40T CNC chainring ensures efficient power transfer for strong sprints.
From its integrated seatpost to its aerodynamic design, every detail of the GT Speed Series Junior is focused on providing maximum performance and confidence for young racers. Whether it’s their first race or they’re gunning for the podium, this bike is the ultimate tool for aspiring BMX champions.
Occasionally, without notice, manufacturers change product design and/or specifications.
| 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, 3/8" Dropouts |
| Headset | 1" Sealed Integrated (38.2 x 45) |
| Stem | GT Top Load, Cold Forged 1", 40mm |
| Bars | GT Speed Alloy 4"H x 24"W, 8° Back, 2° Up |
| Front Brake | Promax MV-87, 85mm Cold Forged AL Arms, Mini V-Type |
| Rear Brake | Promax MV-87, 85mm Cold Forged AL Arms, Mini V-Type |
| Brake Lever | Alloy V-type |
| Front Mech | Null |
| Rear Mech | Null |
| Shifters | Null |
| Speed | 1 |
| Rims | Alloy Double Wall, 28h |
| Front Hub | GT Speed Series, Alloy Sealed, 3/8" Female Allen Bolt |
| Rear Hub | GT Speed Series, Alloy Sealed 3/8" Female Allen Bolt Cassette |
| Spokes | Stainless Steel, 14g |
| Front Tyre | Kenda Kompact Pro Race 1-3/8" |
| Rear Tyre | Kenda Kompact Pro Race 1-1/8" |
| Seat Post | Integrated |
| Saddle | BOX Echelon |
| Chainset | GT Forged Alloy 2pc., 155mm Arms, 24mm Hollow/ Alloy Spindle, 40T AL CNC Chain Ring, Alloy Chain Ring Bolts |
| Bottom Bracket | EB24 Sealed Bearings |
| Chain | KMC Z1 Narrow, 3/32" |
| Cassette | 16T Cog |
| Pedals | GT Mini Platform |
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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