Speed Series Junior

Inspired by the Speed Series Pro models and featuring reverse rear dropouts for quick gear changes. Each model size is purpose designed and spec'd to be lightweight, offering maximum performance to meet each racers needs. Ideal for riders 4'4"-4'10".
  • Speed Alloy Frame with Reverse Dropouts
  • Speed Series Aero Double Wall rims
  • Kenda Kompact Pro Race tires
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Quick Gear Changes

Featuring reverse rear dropouts for quick gear changes

Speed Series Junior

The Speed Series Junior is ideal for riders 4'4"-4'10


frame GT Speed Series MK7 Junior Race, 6061-T6 AL, Alloy Formed and Butted Speed Metal Tubes, Reverse Dropouts, Euro BB, 1" Integrated H/T
sizes available JUNIOR
fork GT BMX Junior Race, 6061 AL 1" Steerer, 312mm A/C, 3/8" Dropouts
wheel size 20


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
front tire Kenda Kompact Pro Race 1-3/8"
rear tire Kenda Kompact Pro Race 1-1/8"
spokes Stainless Steel, 14g


rear cogs 16T Cog
chain KMC Z1 Narrow, 3/32"
crank GT Forged Alloy 2pc., 155mm Arms, 24mm Hollow/ Alloy Spindle, 104 BCD 40T AL CNC Chain Ring, Alloy Chain Ring Bolts
bottom bracket EB24 Sealed Bearings
chain device 6061 AL CNC Chain Tensioners
pedals GT Mini Platform


handlebar GT Speed Alloy 4"H x 24"W, 8° Back, 2° Up, Taper Cross Bar
stem GT Top Load, Cold Forged 1", 40mm
grips GT Statement
headset 1" Sealed Integrated (38.2 x 45)
seatpost Integrated
saddle BOX Echelon


brakes Promax MV-87, 85mm Cold Forged AL Arms, Mini V-Type
brake levers Alloy V-type


Sizes (in) Junior
Top tube actual 18.5
Head tube angle 73 °
Seat tube angle 70 °
Standover 6.25
Head tube length 4
Wheelbase 33.8
Front center 20.66
Chainstay length 13.19
Bottom bracket height 11
Seat post diameter 22.2
Axel to crown 12
Dropouts 10mm
Brake mounts V-Brakes
Rider area 20.3
Bottom bracket type BSA
Fork rake 1.3
Axel to crown 12

Fit Guide

2'0" - 4'0"
4'0" - 4'4"
4'3" - 4'7"
4'6" - 5'5"
Expert XL
5'2" - 5'6"
5'4" - 5'8"
Pro XL
5'7" - 6'0"
6'0" - 6'5"
6'0" - 6'5"
Pro XL 24"
5'6" - 6'5"

GT Tech Book

GT Owner's Manual