GT Grunge 12"

Name: GT Grunge 12"
Brand: GT

2020 YouthGeneral youth Manufacturer page

Suspension: Rigid
Wheels: 12″
Drivetrain: 1 × 1 24t / 16t
Gear range: 100%
Frame: Steel
Brakes: Coaster brake

Rider height by size (cm)

Size guide

XS 151–164
SM 159–170
MD 165–177
LG 171–184

Components

4 of 19 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.

Frame and fork

1 part

Frame

12" GT LegitFit Design, Hi-Ten Steel Not identified

Suspension

1 part

Fork
- GT

Drivetrain

4 parts

Bottom bracket

Steel, Ball type Not identified
Cassette

16T Coaster Not identified
Chain
- KMC
Crankset

Forged One-Piece Type, 89mm, steel, 24T Not identified

Brakes

1 part

Brakes

Coaster rear, Front: Coaster rear, Rear: Coaster rear Not identified

Wheels and tires

5 parts

Front hub

Steel, Nutted axle Not identified
Rear hub

Steel, nutted axle, coaster brake Not identified
Rims

Alloy, 16h Not identified
Spokes

Stainless Steel, 14g Not identified
Tires
- GT

Cockpit and contact points

7 parts

Grips

95mm closed end Not identified
Handlebar

Steel Riser bar, 130mm rise, 480mm width Not identified
Headset

Steel, 1" threaded Not identified
Pedals

Jr. BMX design, resin Not identified
Saddle
- GT
Seatpost

Alloy Not identified
Stem

2-Bolt alloy top, steel quill Not identified

Sizes and geometry

4 sizes

Enter your height to highlight matching ranges.

Size Reported by the manufacturer

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
Frame material: Steel
Fork material: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 24
Largest chainring: 24
Rear sprockets: 1
Smallest sprocket: 16
Largest sprocket: 16
Lowest gear: 18.0 in
Highest gear: 18.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Coaster brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: No shifting

Additional specifications

Tire width: 2.25″
Wheel material: Aluminum
Wheel size: 12″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.9 km/h
Highest gear: 6.9 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: 18.0–18.0 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 2020 builds

Differences across 2020 builds
Specification	This bicycle GT Grunge 12"	GT Grunge 16"	GT Grunge 20"
Frame
Frame material	Steel	Aluminum	Aluminum
Drivetrain
Smallest chainring	24	28	32
Largest chainring	24	28	32
Lowest gear	18.0 in	28.0 in	40.0 in
Highest gear	18.0 in	28.0 in	40.0 in
Other specifications
Tire width	2.25″	1.95″	1.95″
Wheel size	12″	16″	20″