Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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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 2006 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
Rear tire: 20×1.75.
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
2006 GT Power Series Ultra Box
Overview
Model Year
2004
2006
Brand
GT
GT
Model
Power Series Ultra Box
Power Series Ultra Box
Bicycle Type
BMX
BMX
Original MSRP
$699.99
$749.99
Colors
Blue
Team Blue/Silver two tone
Sizes
Pro XL
20" wheel
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
6061 T6 aluminum
GT Ultra Box design, 6061-T6 aluminum
Fork
GT
GT BMX design
Fork Material
Chromoly, unicrown crown
Aluminum/chromoly
Drivetrain
Component Group
—
BMX
Crankset
TruVativ Racing Team, 44 teeth
Truvativ 180mm "Racing Team", 44 teeth
Bottom Bracket
TruVativ GIGA pipe DH
TruVativ GIGA pipe DH
BB Shell Width
68mm English
—
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC Z610HX, 1/2 X 1/8"
KMC Z610HX
Pedals
Wellgo clipless
GT design, CNC aluminum platform, CNC cr-mo axle, sealed bearings
Brakes
Brakes
Tektro BX-25 rear brakes, Tektro BX-2 rear levers
Alloy side-pull caliper front/Tektro, BX-25, cold forged aluminum, cartridge pads rear brakes, Tektro, BX-2 "Sabre", hinged clamp, aluminum levers
Cockpit & Contact Points
Headset
1 1/8" threadless FSA Orbit Z
FSA "Orbit Z"
Handlebar
GT BMX
GT BMX Race bend, Cr-mo, 7.9" rise
Stem
GT Piston
'05 GT BMX Race design, cold forged aluminum
Saddle
SDG I-Fly
SDG "I-Fly" railess design, stitched cover
Seatpost
SDG I-Fly, 27.0mm diameter
SDG "I-Fly" aluminum micro adjust design
Wheels & Tires
Hubs
GT BMX
'05 GT BMX branded, aluminum body, Sealed Bearings, Hollow Cr-Mo axle
Rims
Alex Supra B, 36-hole
Sun Rhyno Lite XL, welded double wall with eyelets, 36 hole, 29mm width, 36-hole
Spokes
Steel, 14ga. (2.0mm) straight gauge
14ga. (2.0mm) Straight Gauge
Spoke Nipples
Brass nipples
Aluminum, 14 G, Black
Front Tire
20 x 2.125" IRC Siren
20 x 1.95" Kenda K-Rad
Rear Tire
20 x 1.75" IRC Siren
20 x 1.75" Kenda K-Rad
Wheel Size
20" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.