Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2021 GT Siren 16"
Previous used estimate
$114 - $117
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 GT Siren 16"
12-month projected trend
9%
Direction and magnitude, not judgment
vs. category average
5%
Holds value better than category avg
Price over time - 2021 GT Siren 16"
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Siren model years
Overview
About this bike
At this size, what you need is a lightweight bike made with an aluminum frame, with super-easy handling, all the fun and no fuss—the all-terrain 16" tires roll smooth, the simple single-speed keeps it durable, and the numberplate is for the budding 'crosser ready to go blast around the local neighborhood. - Improved Geometry bikes with the LegitFit system feature geometry adjustments to improve ergonomics for youth statures. The result: Increased stability, comfort and confidence for a wider range of riders. - Easier Pedaling bikes with the LegitFit system have their pedal positions moved slightly forward. The result: Makes it easier to pedal. - Better Positioning bikes with the LegitFit system have narrower crank and pedal positions that match the width of a child’s hips. The result: A stronger, more natural pedal stroke.
Specifications
- Subtype
- 16-inch
- Category
- Kids
- Component Fork
- GT Hi-Ten Steel, 1" Threaded Steerer
- Component Hubs
- Front: Steel, Nutted Axle Rear: Steel, Nutted Axle, Coaster Brake
- Component Size
- 16-inch
- Component Stem
- 2-Bolt Alloy Top, Steel Quill
- Product Family
- Siren
- Component Chain
- KMC HV410 1/2" x 1/8"
- Component Color
- Gloss Pitch Green/Gloss Pink, Gloss Purple/Orange/Peach
- Component Frame
- 16" GT LegitFit Design, Alloy
- Component Tires
- GT 16 x 1.95"
- Component Brakes
- Coaster Rear
- Component Pedals
- Jr. BMX Design, Resin
- Component Saddle
- GT 1-piece
- Component Headset
- 1" Threaded, Steel
- Component Crankset
- Forged One-Piece Type, 89mm, Steel
- Component Chainrings
- 28T
- Component Handlebars
- Steel Riser Bar, 130mm Rise, 500mm Width
- Component Tape Grips
- 95mm Closed End
- Component Bottom Bracket
- Steel, Ball Type
- Component Accessories Extras
- Training Wheels, Fender, Bar, Stem Pad
- Hubs
- Front: Steel, Nutted Axle Rear: Steel, Nutted Axle, Coaster Brake
- Tires
- GT 16 x 1.95"
- Crankset
- Forged One-Piece Type, 89mm, Steel
- Pedals
- Jr. BMX Design, Resin
- Bottom Bracket
- Steel, Ball Type
- Chain
- KMC HV410 1/2" x 1/8"
- Saddle
- GT 1-piece
- Headset
- 1" Threaded, Steel
- Stem
- 2-Bolt Alloy Top, Steel Quill
- Accessories & Extras
- Training Wheels, Fender, Bar, Stem Pad
- Brakes
- Coaster Rear
- Chainrings
- 28T
- Fork
- GT Hi-Ten Steel, 1" Threaded Steerer
- Frame
- 16" GT LegitFit Design, Alloy
- Handlebars
- Steel Riser Bar, 130mm Rise, 500mm Width
- Tape/Grips
- 95mm Closed End
- Color
- Gloss Purple/Orange/Peach
- Size
- 16-inch
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.