GT Stomper Prime 20

Name: GT Stomper Prime 20
Brand: GT

2023 YouthMountain youth Manufacturer page

Last known price: $425

Prices shown first for United States
Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 6 30t / 14–28t
Gear range: 200%
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

One Size

The manufacturer did not publish rider heights for these sizes.

Components

12 of 22 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

20" GT LegitFit Design, Alloy w/ Replaceable Hanger Not identified

Suspension

1 part

Fork
- GT

Drivetrain

6 parts

Bottom bracket

Cartridge Sealed Not identified
Cassette
- SunRace
Chain
- KMC Z7 7 speeds
Crankset
- Prowheel 30t
Rear derailleur
- microSHIFT M21 Rear Derailleur 6/7 Speed Long Cage 7 speeds
RD-M21L
Shifters
- microSHIFT Twist Shifters 3×7 7 speeds

Brakes

2 parts

Brake levers
- Tektro
Brakes
- GT

Wheels and tires

5 parts

Front hub

Alloy, QR Not identified
Rear hub

Alloy Freewheel, QR Not identified
Rims

All Terra Double Wall, 28h Not identified
Spokes

Stainless Steel, 14g Not identified
Tires
- Kenda Small Block Eight

Cockpit and contact points

7 parts

Grips
- GT
Handlebar

Steel Riser Bar, 20mm Rise, 540mm Width Not identified
Headset

1 1/8" Ahead Not identified
Pedals
- GT
Saddle
- GT
Seatpost

Alloy Micro Adjust Not identified
Stem

Alloy Ahead, 30mm Not identified

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size One Size

Table

Reach 286mm

Stack 411mm

Wheelbase 839mm

Head angle 69.5°

Seat angle 68.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 20″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	286
Stackmm	411
Top tube lengthmm	452
Seat tube lengthmm	255
Head tube lengthmm	88
Head tube angle	69.5°
Seat tube angle	68°
Chainstay lengthmm	366
Wheelbasemm	839
Front centermm	474
Bottom bracket dropmm	23
Bottom bracket heightmm	243
Standover heightmm	516
Fork rakemm	40
Trailmm	57
Stack/reach ratio	1.44

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 6
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 21.4 in
Highest gear: 42.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2.1″
Wheel material: Aluminum
Wheel size: 20″

Technical analysis

3 measures

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

Lowest gear

21.4 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2023
Sample: 345 bicycles with this information
Coverage: 81.5% of the class

Highest gear

42.9 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2023
Sample: 345 bicycles with this information
Coverage: 81.5% of the class

Shifting

Mechanical

20 of 423 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2023
Sample: 423 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.2 km/h
Highest gear: 16.4 km/h

Total gear range 200%

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: 21.4–42.9 gear inches
Class reference (p10–p90): 14.0–78.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2023
Lowest gear: 345 bicycles with this information, 81.5% of the class
Highest gear: 345 bicycles with this information, 81.5% 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 2023 builds
Specification	This bicycle GT Stomper Prime 20	GT Stomper Ace 24	GT Stomper Ace 26	GT Stomper FS Ace	GT Stomper Prime 24	GT Stomper Prime 26
Frame
Fork material	Steel	Not informed	Not informed	Not informed	Not informed	Not informed
Suspension
Suspension configuration	Rigid	Hardtail	Hardtail	Full suspension	Hardtail	Hardtail
Front travel	Not informed	50 mm	100 mm	130 mm	50 mm	100 mm
Rear travel	Not informed	Not informed	Not informed	120 mm	Not informed	Not informed
Drivetrain
Rear sprockets	6	8	8	10	7	7
Smallest sprocket	14	11	11	11	14	14
Largest sprocket	28	34	34	48	28	34
Lowest gear	21.4 in	21.2 in	22.9 in	16.3 in	25.7 in	22.9 in
Highest gear	42.9 in	65.5 in	70.9 in	70.9 in	51.4 in	55.7 in
Brakes
Brake type	Rim brake	Mechanical disc	Mechanical disc	Hydraulic disc	Rim brake	Rim brake
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost
Derailleur hanger	Not informed	Not informed	Not informed	UDH	Not informed	Not informed
Other specifications
Suspension	Rigid	Hardtail	Hardtail	Full suspension	Hardtail	Hardtail
Tire width	2.1″	2.1″	2.1″	2.3″	2.1″	2.1″
Wheel size	20″	24″	26″	26″	24″	26″
Fork spring	Not informed	Coil	Coil	Air	Coil	Coil
Bottom bracket standard	Not informed	Not informed	Not informed	BSA	Not informed	Not informed