GT Speed Series Junior BMX Race Bike

Regular price $689.95 $482.97 Out of Stock

GT Speed Series Junior BMX Race Bike

Regular price $689.95 $482.97 Out of Stock
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  • The GT Speed Series Junior BMX Race Bike was inspired by the Speed Series Pro Models featuring reverse rear dropouts for quick gear changes.

    This model is purpose designed and spec'd to be incredibly lightweight offering maximum performance to meet each racer's needs. The Speed Series Junior model is the perfect size for riders between 4' 4" - 4' 10".

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Product Specs
  2. WHEEL SIZE: 20"
  3. TOP TUBE LENGTH: 18.5"
  4. CHAIN STAY LENGTH: 13.19"
  7. FORKS: GT BMX Junior Race, 6061 Aluminium, 1" Steerer
  8. BARS: GT Speed Alloy, 8° Backsweep, 2° Upsweep
  9. STEM: GT Top Load, 40mm
  10. HEADSET: 1" Integrated Design, 45 x 45 Degree Sealed Bearings
  12. BRAKES: Promax MV-87, Cold-Forged Arms, Mini V-type
  13. FRONT HUB: Gt Speed Series, Sealed Bearings, 28h, 3/8" Female Allen Bolts
  14. FRONT RIM: Speed Series Aero, Double Wall, 28h
  15. REAR HUB: GT Speed Series Cassette, 5 Sealed Bearings, 28h, 3/8" Female Allen Bolts w/Alloy Washers
  16. REAR RIM: Speed Series Aero, Double Wall, 28h
  17. TYRES: Kenda Kompact Pro Race, 20 x 1-3/8"
  18. SPROCKET: 36T
  19. CRANKS: GT Forged Alloy 2-Piece
  20. BB: EB24 Sealed Bearings
  21. PEDALS: GT Mini Size Platform
  22. SEAT: BOX Echelon
  23. GEARING: 36/16

Product Highlights
  • A full size 20” wheel with smaller geometry to suit riders typically fitting a 18” wheeled bike (3'6" - 4’6” / 105cm - 135cm)
  • BMX Racing specific bike
  • Built strong and lightweight
  • Great spec for a BMX in this price bracket
  • Strong and durable crankset


We have compiled a complete BMX Race Bike Buyers Guide to help you through the process of finding your perfect race bike. Here at sourcebmx we are all riders so we can offer advice that only 100% rider-owned bmx shops can - just ask!

Click here to view all BMX Race Bikes


The first thing you will need to do is make sure you get the correct size BMX race bike, based on your height. BMX race bikes are sized from Mini (The smallest) through to Pro (adult) sizes. These sizes refer to the overall size of the frames and parts but the wheel diameter will remain the same at 20” despite the width of the tyres varying.

Take a ride through our handy guide to find out what size bike best suits you.

Note: there is some overlap between sizes as personal preference comes into the equation.
Rider Height (ft & in) Rider Height (cm) Wheel Width (in)  Bike Size
Up to 4'4" Up to 130cm 1 - 1/8 Micro Mini
4'2" - 4'10" 127cm - 148cm 1 - 1/8 Mini
4'6" - 5'1" 138cm - 155cm 1 - 1/8 Junior
5'0" - 5'4" 150cm - 165cm 1 - 3/8 Expert
5'2" - 5'6" 155cm - 170cm 1 - 3/8 Expert XL
5'3" - 5'8" 160cm - 175cm 1.75 Pro
5'7" - 6'0" 170cm - 185cm 1.75 Pro XL
6'0" + 185cm + 1.75 Pro XL +

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