Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2019 GT Mach One Junior
Previous used estimate
$109 - $112
Actual value depends on condition, size, and local demand.
Value Guide market data · 2019 GT Mach One Junior
12-month projected trend
4%
Direction and magnitude, not judgment
vs. category average
1%
Holds value better than category avg
Price over time - 2019 GT Mach One Junior
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Mach One model years
2021$174 - $179▲ 60% vs. 2019
2020$138 - $142▲ 27% vs. 20192019$109 - $112Currently viewing
2018$122 - $126▲ 12% vs. 2019
2017$109 - $1120% vs. 2019
2016$102 - $105▼ 6% vs. 2019
2015$99 - $102▼ 9% vs. 2019
2012$71 - $73▼ 35% vs. 2019
2011$71 - $73▼ 35% vs. 2019
2006$63 - $65▼ 42% vs. 2019
2005$63 - $65▼ 42% vs. 2019Compare Mach One Junior models
1 modelsChoose a different build or frame style to see its value.
Overview
About this bike
Designed to be the perfect introduction into the world of racing, the Mach One Junior is built to suit the needs of aspiring competitors. A durable aluminum frame is paired with a hi-tensile steel fork for a platform that will hold up to the abuses of BMX riding, especially for those just starting to learn the ropes. Competition-ready components include a top-load stem, one-piece seatpost/saddle, and Kenda Race tires.
Specifications
- Subtype
- BMX
- Category
- BMX
- Component Fork
- GT BMX Junior Race, Hi-Ten Steel 1" Steerer, Oval 31.8 X 1.4mm Blades, 315mm A/C, 3/8" Dropouts
- Component Hubs
- Steel Body, 3/8" Axle
- Component Size
- 18.5-inch
- Component Stem
- GT Top Load 1" Aluminum, 40mm Length
- Product Family
- Mach One
- Component Chain
- KMC Z410
- Component Color
- Gloss Electric Blue
- Component Frame
- GT Mach One Race, 6061-T6 AL, Euro BB, Reverse Dropouts, 1" Integrated H/T
- Component Brakes
- Rear Alloy V-type
- Component Pedals
- GT Low Profile FS Platform Design, PP Material, Boron Axle
- Component Saddle
- GT Uni Mini Kevlar padded
- Component Headset
- 1" Integrated Design, Sealed Bearings
- Component Crankset
- Alloy Forged 3-Piece, Square Taper, 140mm, BCD110
- Component Handlebar
- GT Race, Steel, 4"H x 24"W 8° sweep, 2° Up, 19mm O.D. Cross Bar
- Component Seat Post
- AL Integrated w/ Saddle, 25.4 x 150mm
- Component Chainrings
- 36T Steel
- Component Front Tire
- Kenda Race, 20 x 1-3/8" front, 1-1/8" rear
- Component Tape Grips
- GT Statement
- Component Brake Levers
- Alloy
- Component Bottom Bracket
- External Euro Sealed Bearings
- Hubs
- Steel Body, 3/8" Axle
- Crankset
- Alloy Forged 3-Piece, Square Taper, 140mm, BCD110
- Pedals
- GT Low Profile FS Platform Design, PP Material, Boron Axle
- Bottom Bracket
- External Euro Sealed Bearings
- Chain
- KMC Z410
- Saddle
- GT Uni Mini Kevlar padded
- Handlebar
- GT Race, Steel, 4"H x 24"W 8° sweep, 2° Up, 19mm O.D. Cross Bar
- Headset
- 1" Integrated Design, Sealed Bearings
- Stem
- GT Top Load 1" Aluminum, 40mm Length
- Brake Levers
- Alloy
- Brakes
- Rear Alloy V-type
- Chainrings
- 36T Steel
- Fork
- GT BMX Junior Race, Hi-Ten Steel 1" Steerer, Oval 31.8 X 1.4mm Blades, 315mm A/C, 3/8" Dropouts
- Frame
- GT Mach One Race, 6061-T6 AL, Euro BB, Reverse Dropouts, 1" Integrated H/T
- Seat Post
- AL Integrated w/ Saddle, 25.4 x 150mm
- Tape/Grips
- GT Statement
- Color
- Gloss Electric Blue
- Size
- 18.5-inch
- Front Tire
- Kenda Race, 20 x 1-3/8" front, 1-1/8" rear
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.