2020 GT

Grunge 12"

A 12″ steel frame general youth bike with coaster brakes.
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Manufacturer Price

A$319 (~$216)
FrameSteel
SuspensionRigid
ForkSteel
Wheels12″ Aluminum
DrivetrainSingle-speed
BrakesCoaster
View on gtbicycles.comLearn about GT
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Insights
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

5 mph

Grunge 12"

18 mph

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Highest gear

(descending)

Sizing
XS

4'11" – 5'5"

SM

5'2" – 5'7"

MD

5'4" – 5'10"

LG

5'7" – 6'1"

🐐 Estimated

Rider Fit Notes

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Specs
Build
Frame

12" GT LegitFit Design, Hi-Ten Steel

Fork

GT Hi-Ten Steel, 1" threaded steerer

Bottom Bracket

Steel, Ball type

Headset

Steel, 1" threaded

Stem

2-Bolt alloy top, steel quill

Handlebar

Steel Riser bar, 130mm rise, 480mm width

Saddle

GT 1-piece

Seatpost

Alloy

Type: Rigid

Pedals

Jr. BMX design, resin

Grips

95mm closed end

Groupset
Crank

Forged One-Piece Type, 89mm, steel, 24T

Cassette

16T Coaster

Chain

KMC HV410 1/2" x 1/8"

Brakes

Coaster rear

Type: Coaster

Wheels
Rims

Alloy, 16h

Spokes

Stainless Steel, 14g

Front Hub

Steel, Nutted axle

Rear Hub

Steel, nutted axle, coaster brake

Tires

GT 12 x 2.25"GT 12 x 2.25" GT 12 x 2.25"

Rider Notes
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Last updated September 16
Not listed for 216 days