Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2019 GT Siren Coaster 20"
Value Guide market data · 2019 GT Siren Coaster 20"
12-month trend
3%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2019 GT Siren Coaster 20"
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Siren model years
2019 Siren Coaster 20" lineup
Overview
About this bike
2019 GT Siren Coaster 20" value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Fork
- GT Hi-Ten Steel, 1" Threaded Steerer
- Frame
- 20" GT LegitFit Design, Alloy
Drivetrain
- Groupset
- 2019 GT Siren Coaster 20"
- Crankset
- Forged One-Piece Type, 127mm
- Chain
- KMC Z410A
- Cassette/Rear Cogs
- 16T Coaster
- Chainrings
- 32T
Brakes
- Brakes
- V-Brake, Coaster rear
Cockpit
- Saddle
- GT 1-piece
- Stem
- 2-Bolt Alloy Top, Steel Quill
- Handlebars
- Steel Riser bar, 176mm rise, 580mm
- Seat Post
- Alloy
- Tape/Grips
- 120mm closed end
Wheels & Tires
- Rims
- Alloy, 28h
- Tires
- GT 20 x 1.95"
Pedals
- Pedals
- Jr. BMX design, resin
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.