Mach One Expert

Entry to BMX Racing shouldn’t cost an arm and a leg. The Mach One Expert is made to fit riders 4'8"-5'4".

  • Influence by Speed alloy frame with reverse dropouts
  • GT Top Load Stem
  • GT Alloy Forged 3pc, Square Taper, 130 BCD Spider
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Mach One Expert

The Mach One Expert is made to fit riders 4'8"-5'4"

Track ready entry level race bike

Allows riders to test the waters of racing without breaking the bank

Upgradeable Aluminum Race Frame

Influenced by the Speed Series frame allows riders to take the bike spec from amateur to pro


frame GT Mach One Race MK2, 6061 Alloy, Euro BB, Reverse Dropouts, V-Brakes, 1-1/8" Integrated H/T
sizes available EXPERT
fork GT BMX Race, Hi-Ten Steel 1 1/8" Steerer, 312mm A/C, 3/8" Dropouts
wheel size 20


rims Alloy Double Wall, 28h
front hub Steel Body, 28h, 3/8" Axle
rear hub Steel Flip Flop Thread-on Body, Freewheel, 28h, 3/8" Axle
front tire Kenda Race, 20 x 1-3/8"
rear tire Kenda Race, 20 x 1-3/8"
spokes Stainless Steel, 14g


rear cogs 16T Freewheel
chain KMC S1
crank GT Alloy Forged 3pc, 165mm, Square Taper, 130 BCD 42T Steel Chainring
bottom bracket Threaded Square Type
pedals GT Mini Size Platform, PP Material


handlebar GT Race, Steel, 6.5"H x 26"W, 8° Back, 4° Up, 19mm O.D. Cross Bar
stem GT Top Load, 40mm
grips GT Statement
headset 1-1/8" Sealed Integrated (41.8 x 45)
seatpost Combo Alloy 22.2 Integrated
saddle GT Uni Mini Padded


brakes Alloy V-type
brake levers Alloy V-type


Sizes (in) Expert
Top tube actual 18.75
Head tube angle 73 °
Seat tube angle 72 °
Standover 7
Head tube length 4.33
Wheelbase 34.86
Front center 21.82
Chainstay length 13.39
Bottom bracket height 11.5
Seat post diameter 0.875
Axel to crown 12.2
Dropouts 10mm
Head tube type Integrated
Brake mounts V-Brake
Rider area 21.46
Bottom bracket type Threaded
Fork rake 1.3
Axel to crown 12.2

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