Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2021 GT Grunge 12"
Value Guide market data · 2021 GT Grunge 12"
12-month trend
8%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2021 GT Grunge 12"
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Grunge model years
2021 Grunge 12" lineup
Overview
About this bike
2021 GT Grunge 12" value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Brakes
- Brakes
- Coaster Rear
Cockpit
- Tape/Grips
- 95mm Closed End
Wheels & Tires
- Hubs
- Front: Steel, Nutted Axle<br>Rear: Steel, Nutted Axle, Coaster Brake
Pedals
- Pedals
- Jr. BMX Design, Resin
Accessories
- Accessories & Extras
- Training Wheels, Fender, Bar, Stem Pad
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.