GT Grunge Boy's 12"

Name: GT Grunge Boy's 12"
Brand: GT

2018 YouthGeneral youth Manufacturer page

Last known price: $159

Prices shown first for United States
Suspension: Rigid
Wheels: 12″
Drivetrain: 1 × 1 24t / 16t
Gear range: 100%
Frame: Steel
Brakes: Coaster brake

Not published by the manufacturer

Sizes and geometry

Components

4 of 17 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

(F) N/A, (R) Coaster, Rear: (F) N/A, (R) Coaster Not identified

Wheels and tires

3 parts

Front hub

(F) Steel, 16 Hole, 3/8" Axle, (R) Steel, 16 Hole,Coaster Not identified
Rims

Alloy, 16 hole Not identified
Tires
- GT

Cockpit and contact points

7 parts

Grips

95mm closed end Not identified
Handlebar

Steel 480mm width x 130mm rise Not identified
Headset

Steel, 1" Not identified
Pedals

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

Alloy Not identified
Stem

2-Bolt Alloy Top, Steel Quill Not identified

Specifications

Frame and fork

Intended fit: boys
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″

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

18.0 gear inches

This value is below the central range for this class.

Cohort: Youth / General youth Model year: 2018
Sample: 137 bicycles with this information
Coverage: 71.3% of the class

Highest gear

18.0 gear inches

This value is below the central range for this class.

Cohort: Youth / General youth Model year: 2018
Sample: 137 bicycles with this information
Coverage: 71.3% of the class

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
Class reference (p10–p90): 17.9–78.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / General youth Model year: 2018
Lowest gear: 137 bicycles with this information, 71.3% of the class
Highest gear: 137 bicycles with this information, 71.3% of the class

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 2018 builds

Differences across 2018 builds
Specification	This bicycle GT Grunge Boy's 12"	GT Grunge Coaster 16"	GT Grunge Coaster 20"
Frame
Intended fit	boys	Unisex	Unisex
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″