Velopedia Bicycle Archive
Compare Bicycles
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 2012 GT Air and 2009 GT Air.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.54:1
Speed unavailable: wheel or tire size is missing or unclear.
Ratio2.63:1
Estimated speed at 90 RPMGear
Uses front tire 20×2.1; 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
2012 GT Air
2009 GT Air
Overview
Model Year
2012
2009
Brand
GT
GT
Model
Air
Air
Bicycle Type
BMX
BMX
Original MSRP
Not documented
$269.99
Colors
Bright Yellow, Satin Grey
White
Sizes
One Size
19.5" TT
Weight
—
—
Frameset
Frame Construction
—
TIG-welded
Frame Material
Straight Guage Hi-Ten
High Tensile Steel
Fork
GT Hi-Ten
GT Freestyle
Fork Material
—
High-tensile steel, unicrown crown
Drivetrain
Component Group
—
BMX
Crankset
GT 1-pc 165mm 33t
Steel One Piece, 42 teeth
Bottom Bracket
American BB
Steel
Cassette
Odyssey Cro-Mo 13t
Freewheel
Rear Cogs
—
1-speed, 16 teeth
Chain
KMC Z410
KMC Z510
Pedals
GT Expert Plastic
GT Jump design, resin
Brakes
Brakes
C-Star U-Brake
Tektro 907 U-brake brakes, Tektro 289A levers
Cockpit & Contact Points
Headset
FSA External
1 1/8" TH
Handlebar
GT Freestyle
GT dirt/street Hi-Ten
Handlebar Extensions
—
Not included
Stem
GT Freestyle
GT Freestyle aluminum
Saddle
GT Dirt Rail
GT freestyle
Seatpost
Steel 25.4 mm
Steel, 25.4mm diameter
Wheels & Tires
Hubs
steel steel
Front: Sealed mech, Rear: Sealed mech, freewheel
Rims
—
Mags
Front Tire
GT Dirt 2.125
20 x 2.10" GT Air Bags
Wheel Size
—
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.