Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Data limitation
No geometry is recorded for 2004 GT Power Series Ultra Box and 2003 GT Power Series Ultra Box.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.75:1
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
Ratio2.75:1
Estimated speed at 90 RPMGear
Uses front tire 20×2.125; 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.
Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
Specification
2004 GT Power Series Ultra Box
2003 GT Power Series Ultra Box
Overview
Model Year
2004
2003
Brand
GT
GT
Model
Power Series Ultra Box
Power Series Ultra Box
Bicycle Type
BMX
BMX
Original MSRP
$699.99
$749.99
Colors
Blue
Avus Blue
Sizes
Pro XL
One
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
6061 T6 aluminum
6061 T6 aluminum
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
TruVativ Racing Team, 44 teeth
GT 3-piece chromoly, 44 teeth
Bottom Bracket
TruVativ GIGA pipe DH
Sealed cartridge
BB Shell Width
68mm English
Euro
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC Z610HX, 1/2 X 1/8"
KMC Z610HX, 1/2 X 3/16"
Pedals
Wellgo clipless
GT BMX Design Aluminum
Brakes
Brakes
Tektro BX-25 rear brakes, Tektro BX-2 rear levers
Tektro BX-25 rear brakes, Tektro BX-2 rear levers
Cockpit & Contact Points
Headset
1 1/8" threadless FSA Orbit Z
1 1/8" threadless FSA Orbit Z
Handlebar
GT BMX
GT BMX
Stem
GT Piston
GT Piston
Saddle
SDG I-Fly
GT Dropnose
Seatpost
SDG I-Fly, 27.0mm diameter
Aluminum micro-adjust, 31.6mm diameter
Wheels & Tires
Hubs
GT BMX
GT Rhythm System II
Rims
Alex Supra B, 36-hole
GT Rhythm System
Spokes
Steel, 14ga. (2.0mm) straight gauge
Stainless steel, 14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
Aluminum nipples
Front Tire
20 x 2.125" IRC Siren
20 x 2.125" IRC Siren
Rear Tire
20 x 1.75" IRC Siren
—
Wheel Size
20" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.