MSRP | $180 | $210 | $230 |
|---|---|---|---|
Where to Buy | — $1 At | — $1 At | — $1 At |
Category | General Youth | General Youth | General Youth |
| Steel | Aluminum | Aluminum | |
Fork | Steel | Steel | Steel |
Wheels | Aluminum | Aluminum | Aluminum |
Wheel Size | 12″ | 16″ | 20″ |
Brakes | Coaster | Coaster | Coaster |
Drivetrain | Single-speed | Single-speed | Single-speed |
Brand Site | |||
Summary | The GT Grunge Boy's 12", GT Grunge Coaster 16", and GT Grunge Coaster 20" are all general youth bikes with coaster brakes. The Grunge Boy's 12" has a steel frame and 12″ aluminum wheels, the Grunge Coaster 16" has 16″ aluminum wheels, and the Grunge Coaster 20" has 20″ aluminum wheels and higher gearing. | ||
Frame | 12" GT LegitFit Design, Hi-Ten Steel | 16" GT LegitFit Design, Alloy | 20" GT LegitFit Design, Alloy |
|---|---|---|---|
Fork | GT Hi-Ten Steel, 1" Threaded Steerer | GT Hi-Ten Steel, 1" Threaded Steerer | GT Hi-Ten Steel, 1" Threaded Steerer |
Bottom Bracket | Steel, Ball type | Steel, Ball type | Steel, Ball type |
Headset | Steel, 1" | Steel, 1" | Steel, 1" |
Stem | 2-Bolt Alloy Top, Steel Quill | 2-Bolt Alloy Top, Steel Quill, 30 | 2-Bolt Alloy Top, Steel Quill |
Handlebar | Steel Riser bar, 130mm rise, 480mm | Steel Riser bar, 130mm rise, 500mm | Steel Riser bar, 176mm rise, 580mm |
Saddle | GT 1-piece | GT 1-piece | GT 1-piece |
Seatpost | Alloy | Alloy | Alloy |
Pedals | Jr. BMX design, resin | Jr. BMX design, resin | Jr. BMX design, resin |
Grips | 95mm closed end | 95mm closed end | 120mm closed end |
Crank | Forged One-Piece Type, 89mm, Steel, 24T | Forged One-Piece Type, 89mm, Steel, 28T | Forged One-Piece Type, 127mm, 32T |
|---|---|---|---|
Cassette | 16T Coaster | 16T Coaster | 16T Coaster |
Chain | KMC HV410 1/2" x 1/8" | KMC HV410 1/2" x 1/8" | KMC Z410A, 1/2" x 1/8" |
Brakes | Coaster rear | Coaster rear | Coaster rear |
Rims | Alloy, 16h | Alloy, 20h | Alloy, 28h |
|---|---|---|---|
Spokes | Stainless Steel, 14g | Stainless Steel, 14g | Stainless Steel, 14g |
Front Hub | Steel, 16 Hole, 3/8" Axle front, Steel, 16 Hole, Coaster rear | Steel, 20 Hole, 3/8" Axle front, Steel, 20 Hole, Coaster rear | Steel, 28 Hole, 3/8" Axle front, Steel, 28 Hole, Coaster rear |
Tires | GT 12 x 2.25" | GT 16 x 1.95" | GT 20 x 1.95" |