GT Speed Series Junior 2023 - BMX Bike
- Ideal for riders 4'4"-4'10".
- Speed Alloy Frame with Reverse Dropouts
- Speed Series Aero Double Wall rims
- Kenda Kompact Pro Race tires
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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GT Speed Series Junior 2023 - BMX Bike
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