Mach One Junior

Entry to BMX Racing shouldn’t cost an arm and a leg. The Mach One Junior is made to fit riders 4'4"-4'10".

  • 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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Shipping Policy

Free shipping on all orders for bikes, apparel, parts & accessories for any order in the United States. 

*Please allow for 5-7 days of transit time as all orders are shipped via ground shipping.

*If an order is placed on Friday, please allow 2-3 days for processing. 

Please reach out to sales@gtbicycles.com if you have any questions.

Return Policy

Returns are accepted within 30 days of delivery.

Details

  • The bike or part must be in its original packaging to receive a 100% refund.
  •  If product is unused but protective packaging has been removed or has major damage, we will refund 75% of the order.
  • We do not accept returns on apparel.
  • Please allow for 7-10 days to process the return and issue refund.

*Protective packaging includes: foam, cardboard, zip ties, plastic axle covers, warning decals and reflectors.

Please reach out to sales@gtbicycles.com to start a return.

Contact Us

This bike will come partially assembled. Tools needed for assembly are not included. Please refer to these instructions and build video on how to assemble the bike. This bike is not eligible for the GT Connect build program.

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Mach One Junior

The Mach One Junior is made to fit riders 4'4"-4'10"

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

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

Wheels

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

Drivetrain

rear cogs 16T Freewheel
chain KMC S1
crank GT Alloy Forged 3pc, 152mm, Square Taper, 130 BCD 40T Steel Chainring
bottom bracket Threaded Square Type
pedals GT Mini Size Platform, PP Material

Cockpit

handlebar GT Race, Steel, 4"H x 24"w/ 8° Back, 2° 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

brakes Alloy V-type
brake levers Alloy V-type
Please note that, based on component availability and other factors, specifications are subject to change without notice.

Fit Guide

Micro
2'0" - 4'0"
Mini
4'0" - 4'4"
Junior
4'3" - 4'7"
Expert
4'6" - 5'5"
Expert XL
5'2" - 5'6"
Pro
5'4" - 5'8"
Pro XL
5'7" - 6'0"
Pro XXL
6'0" - 6'5"
Pro XXXL
6'0" - 6'5"
Pro XL 24"
5'6" - 6'5"

Geometry

Sizes (in) SM
Top tube actual 18.75
Head tube angle 73° °
Seat tube angle 72° °
Standover 7
Head tube length 4.33
Wheelbase 34.37
Front center 21.02
Chainstay length 13.39
Bottom bracket height 10.75
Seat post diameter 0.875
Axel to crown 12
Dropouts 10mm
Head tube type Integrated
Brake mounts V-Brake
Rider area 20.9
Bottom bracket type Threaded
Fork rake 1.3
Axel to crown 12

GT Tech Book

GT Owner's Manual