Velopedia Bicycle Archive

2011 GT Stomper 20

Original specifications: Mountain Mix drivetrain · 20" wheels.

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At a glance

Archive #25054

Model year: 2011
Category: Kids
Colors: Gloss black, Ano White
In this record: 25 specifications · 2 archived images

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Identification clues

2011 archived details

Published colors: Gloss black, Ano White
Frame: 6061 aluminum
Original equipment: Mountain Mix

Clues, not proof of model year. Colors vary and components may have been replaced.

Original build6061 aluminum · Mountain Mix · 20" wheels

Historical catalog variants

Archived sizes and colors

2 item records

Item-level catalog entries recovered from Velopedia’s original bicycle archive. They document how this model was listed historically; they do not identify the frame size associated with legacy reference geometry or indicate current availability.

Published colors

Gloss BlackAno White

View 2 archived size/color combinations

Size	Color
—	Gloss Black
—	Ano White

Historical catalog evidence. Exact specifications and naming may vary by market, production run or manufacturer revision.

Frameset

Frame Construction	Aluminum
Frame Material	6061 aluminum
Fork	SR M 2000, 75mm travel

Drivetrain

Component Group	Mountain Mix
Shifters	Shimano Revo twist
Rear Derailleur	Shimano TX-30
Crankset	Cotterless aluminum, 36T teeth
Bottom Bracket	3 piece square taper
Cassette	Shimano
Rear Cogs	7-speed, 14 - 28 teeth
Chain	Uniglide
Pedals	High Impact nylon platform

Brakes

Brakes	Tektro linear pull brakes, alloy short reach levers

Cockpit & Contact Points

Headset	Aheadset
Handlebar	Alloy Riser
Handlebar Extensions	Not included
Stem	Ahead alloy ATB
Saddle	Boys Anatomic MTN
Seatpost	Alloy

Wheels & Tires

Hubs	Alloy QR
Rims	ATB aluminum
Spokes	Stainless, 14ga. (2.0mm)
Spoke Nipples	Brass
Front Tire	20 x 1.95" Kenda ATB Dual purpose
Wheel Size	20" wheels

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

Pedal cadence

RPM

Speed units

RPM = pedal turns per minute.

Published build36T · 14–28T · 7-speed

Lowest1.29:1 Highest2.57:1 Total range200%

Estimated speed At 90 RPM Lowest gear6.9 mph Highest gear13.7 mph

Uses front tire 20×1.95; rear size isn’t listed.

How it works

Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.

Speeds are estimates from tire size and pedal cadence. Actual speeds vary.

Try other gearing

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Gears Drivetrain

Front teeth Smallest rear teeth Largest rear teeth

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Rear tire marking

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

Rim diameter (BSD, mm) Tire width (mm)

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Cadence (RPM) Speed units

Gear, dimension and cadence changes update results automatically.

Gearing comparison
Measure	Original	Your setup
Lowest ratio	—	—
Highest ratio	—	—
Total range	—	—
Lowest-gear speed	—	—
Highest-gear speed	—	—

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts & serviceability

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Original specifications

Front tire · Original

20 x 1.95" Kenda ATB Dual purpose

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Brake pads · Original

Tektro linear pull brakes

alloy short reach levers

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Parts and service referenceQuick reference before buying parts

Archived specifications for reference. Check the fitted parts before ordering.

Front tire: 20 x 1.95" Kenda ATB Dual purpose
Drivetrain: 7-speed
Bottom bracket / shell: 3 piece square taper

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Gallery2 images

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

2011 GT Stomper 20