GT Grunge 20

Name: GT Grunge 20
Brand: GT

2023 YouthGeneral youth Manufacturer page

Last known price: $300

Prices shown first for United States
Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 1 32t / 16t
Gear range: 100%
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

4 of 10 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Suspension

1 part

Fork
- GT

Drivetrain

3 parts

Cassette

16T Coaster Not identified
Chain
- KMC S1 1 speed
Crankset

Forged One-Piece Type, 127mm, 32T Not identified

Brakes

1 part

Brakes

Rim Not identified

Wheels and tires

1 part

Tires
- GT

Cockpit and contact points

4 parts

Headset

1" Threaded, Steel Not identified
Pedals

Jr. BMX Design, Resin Not identified
Saddle
- GT
Seatpost

Alloy Not identified

Sizes and geometry

1 size

Rider-height ranges are not published for these sizes.

Size

Geometry not published

The manufacturer lists these sizes without frame measurements, so there is no drawing or geometry table.

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 1
Smallest sprocket: 16
Largest sprocket: 16
Lowest gear: 40.0 in
Highest gear: 40.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: No shifting

Additional specifications

Tire width: 1.95″
Wheel size: 20″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 15.3 km/h
Highest gear: 15.3 km/h

Total gear range 100%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 40.0–40.0 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2023 builds
Specification	This bicycle GT Grunge 20	GT Grunge 12	GT Grunge 16
Frame
Fork material	Steel	Not informed	Not informed
Drivetrain
Front chainrings	1	Not informed	1
Smallest chainring	32	Not informed	28
Largest chainring	32	Not informed	28
Lowest gear	40.0 in	Not informed	28.0 in
Highest gear	40.0 in	Not informed	28.0 in
Cockpit
Shifting	No shifting	Mechanical	No shifting
Other specifications
Tire width	1.95″	2.25″	1.95″
Wheel size	20″	12″	16″

Changes since 2022
Specification	2022 GT Grunge 20"	This bicycle GT Grunge 20
Frame
Frame material	Aluminum	Not informed
Drivetrain
Rear sprockets	Not informed	1
Smallest sprocket	Not informed	16
Largest sprocket	Not informed	16
Lowest gear	Not informed	40.0 in
Highest gear	Not informed	40.0 in
Brakes
Brake type	Coaster brake	Rim brake
Cockpit
Shifting	Mechanical	No shifting
Seatpost	Not informed	Rigid seatpost
Other specifications
Wheel material	Aluminum	Not informed