Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2020 GT Mach One Junior
Previous used estimate
$131 - $134
Actual value depends on condition, size, and local demand.
Value Guide market data · 2020 GT Mach One Junior
12-month projected trend
5%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2020 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▲ 33% vs. 20202020$131 - $134Currently viewing
2019$124 - $128▼ 5% vs. 2020
2018$122 - $126▼ 6% vs. 2020
2017$109 - $112▼ 17% vs. 2020
2016$102 - $105▼ 22% vs. 2020
2015$99 - $102▼ 24% vs. 2020
2012$71 - $73▼ 46% vs. 2020
2011$71 - $73▼ 46% vs. 2020
2006$63 - $65▼ 52% vs. 2020
2005$63 - $65▼ 52% vs. 2020Compare Mach One Junior models
1 modelsChoose a different build or frame style to see its value.
Overview
About this bike
Get in the gate and get racing! The Mach One Junior is designed to be every bit as fast as its bigger sibling, but scaled down to fit younger riders. It features a lightweight aluminum frame, 20" wheels, 36/14 gearing, and a rear V-brake.
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
- Front: Steel Body, 28h, 3/8" Axle
- Component Size
- 18.5-inch
- Component Stem
- GT Top Load 1" Aluminum, 40mm
- Product Family
- Mach One
- Component Chain
- KMC S1
- Component Color
- Red
- Component Frame
- GT Mach One Race, 6061-T6 AL, Euro BB, Reverse Dropouts, 1" Integrated H/T
- Component Brakes
- Alloy V-type
- Component Saddle
- GT Uni Mini Kevlar Padded
- Component Headset
- 1" Integrated Design, 36X45 Degree Sealed Bearings
- Component Crankset
- Alloy Forged 3pc., Square Taper, 140mm, BCD110, Chain Ring Bolts
- Component Handlebar
- GT Race, Steel, 4"H x 24"W 8° Back, 2° Up, 19mm O.D. Cross Bar
- Component Seat Post
- Alloy integrated w/ Saddle, 25.4 x 150mm
- Component Chainrings
- 36T Steel Chain Ring
- Component Front Tire
- Kenda Race, 20 x 1-3/8"
- Component Tape Grips
- GT Statement logo grips
- Component Bottom Bracket
- Euro Sealed Bearings
- Hubs
- Front: Steel Body, 28h, 3/8" Axle
- Crankset
- Alloy Forged 3pc., Square Taper, 140mm, BCD110, Chain Ring Bolts
- Bottom Bracket
- Euro Sealed Bearings
- Chain
- KMC S1
- Saddle
- GT Uni Mini Kevlar Padded
- Handlebar
- GT Race, Steel, 4"H x 24"W 8° Back, 2° Up, 19mm O.D. Cross Bar
- Headset
- 1" Integrated Design, 36X45 Degree Sealed Bearings
- Stem
- GT Top Load 1" Aluminum, 40mm
- Brakes
- Alloy V-type
- Chainrings
- 36T Steel Chain Ring
- 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
- Alloy integrated w/ Saddle, 25.4 x 150mm
- Tape/Grips
- GT Statement logo grips
- Color
- Red
- Size
- 18.5-inch
- Front Tire
- Kenda Race, 20 x 1-3/8"
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.