Velopedia Bicycle Archive

2006 GT Bump

Original specifications: BMX drivetrain · 26" wheels.

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At a glance

Archive #11306
Model year
2006
Category
BMX
Original MSRP
$269.99
Sizes
20" wheel
Colors
RootBeer Brown, Pink
In this record
23 specifications · archived image · original MSRP
Model history 11 other years

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Identification clues

2006 archived details

Published colors
RootBeer Brown, Pink
Frame
3-tube chromoly
Original equipment
BMX

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

Campaign
Original build3-tube chromoly · BMX · 26" 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 sizes

20" wheel

Published colors

RootBeer BrownPink
View 2 archived size/color combinations
SizeColor
20" wheelRootBeer Brown
20" wheelPink

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

Frameset

Frame ConstructionTIG-welded
Frame Material3-tube chromoly
Fork'05 GT dirt jump design
Fork MaterialChromoly

Drivetrain

Component GroupBMX
CranksetGT Tubular Cr-Mo 3pc, 36 teeth
Bottom BracketSteel, ball type
Rear Cogs1-speed, 13 teeth
ChainKMC Z410
Pedals'05 GT Dirt/Street platform design, aluminum body, cr-mo alxe

Brakes

BrakesAlloy side-pull caliper front/Tektro, 907AD, dual anchor bolts, forged aluminum U-brake rear brakes, Tektro, 274A, aluminum levers

Cockpit & Contact Points

Headset1 1/8" Tange Seiki FATTY 22, extra deep cup engagement
HandlebarGT dirt/street bend, Cr-mo, 7" rise
StemGT Johnson III design, cold forged aluminum
SaddleGT "Star 19" two piece design, 9mm rails
SeatpostAluminum double bolt micro adjust

Wheels & Tires

HubsFront: '05 GT branded, aluminum body, sealed Mech. bearings, 3/8" Cr-Mo axle, 36 h, Rear: '05 GT branded, aluminum body, sealed Mech. bearins, 14mm Cr-Mo axle, 36 ho
RimsAlex G22, aluminum, 36 hole, 30mm width, 36-hole
Spokes14ga. (2.0mm) Straight Gauge
Spoke NipplesBrass nipples
Front Tire26 x 2.20" GT-1453
Rear Tire26 X 2.10" GT LP-IV
Wheel Size26" wheels

Gearing

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

RPM

RPM = pedal turns per minute.

Published build36T · 13T · 1-speed
Ratio2.77:1
Estimated speed At 90 RPM Gear19.4 mph

Rear tire: 26×2.1.

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.

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Your gearing setup
Gears

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

Rear tire

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).

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.

Gear, dimension and cadence changes update results automatically.

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

Parts & serviceability

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Original specifications
Rims · Original
Alex G22

aluminum, 36 hole, 30mm width, 36-hole

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Parts and service referenceQuick reference before buying parts

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

Front tire
Front: 26 x 2.20" GT-1453, Rear: 26 x 2.10" GT LP-IV
Drivetrain
1-speed
Bottom bracket / shell
Steel, ball type
Campaign
Equipment inspection checks 10 checks based on 5 archived component groups Open equipment checksClose equipment checks
0 of 10 checked Progress stays in this browser for this record.

Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.

Full used-bike inspection guide →

Frame and fork

Inspect the frame and fork →

Archived: Frame: TIG-welded · Fork: '05 GT dirt jump design · Chromoly

Drivetrain

Check drivetrain wear →

Archived: Group: BMX · Crankset: GT Tubular Cr-Mo 3pc, 36 teeth · Bottom bracket: Steel, ball type · Rear cogs: 1-speed, 13 teeth · Chain: KMC Z410

Brakes

Inspect the brakes →

Archived: Brakes: Alloy side-pull caliper front/Tektro, 907AD, dual anchor bolts, forged aluminum U-brake rear brakes, Tektro, 274A, aluminum levers

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 26" wheels · Rims: Alex G22, aluminum, 36 hole, 30mm width, 36-hole · Hubs: Front: '05 GT branded, aluminum body, sealed Mech. bearings, 3/8" Cr-Mo axle, 36 h, Rear: '05 GT branded, aluminum body, sealed Mech. bearins, 14mm Cr-Mo axle, 36 ho · Front tire: Front: 26 x 2.20" GT-1453, Rear: 26 x 2.10" GT LP-IV

Controls and contact points

Archived: Headset: 1 1/8" Tange Seiki FATTY 22, extra deep cup engagement · Handlebar: GT dirt/street bend, Cr-mo, 7" rise · Stem: GT Johnson III design, cold forged aluminum · Seatpost: Aluminum double bolt micro adjust · Saddle: GT "Star 19" two piece design, 9mm rails · Pedals: '05 GT Dirt/Street platform design, aluminum body, cr-mo alxe

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

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