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 2011 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
Estimated speed at 90 RPMGear
Rear tire: 20×2.1.
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
2011 GT Air
2009 GT Air
Overview
Model Year
2011
2009
Brand
GT
GT
Model
Air
Air
Bicycle Type
BMX
BMX
Original MSRP
Not documented
$269.99
Colors
Black, Neon Orange
White
Sizes
—
19.5" TT
Weight
—
—
Frameset
Frame Construction
Steel
TIG-welded
Frame Material
CroMo
High Tensile Steel
Fork
GT Dirt/Street
GT Freestyle
Fork Material
—
High-tensile steel, unicrown crown
Drivetrain
Component Group
BMX Mix
BMX
Crankset
Forged steel, 33T teeth
Steel One Piece, 42 teeth
Bottom Bracket
Steel
Steel
Cassette
Dnp
Freewheel
Rear Cogs
13 teeth
1-speed, 16 teeth
Chain
KMC Z510
KMC Z510
Pedals
GT Jump design
GT Jump design, resin
Brakes
Brakes
—
Tektro 907 U-brake brakes, Tektro 289A levers
Cockpit & Contact Points
Headset
1 1/8" Threadless
1 1/8" TH
Handlebar
GT dirt/street Cr-mo
GT dirt/street Hi-Ten
Handlebar Extensions
Not included
Not included
Stem
GT freestyle drop
GT Freestyle aluminum
Saddle
GT Slim Mini Street
GT freestyle
Seatpost
Steel, 25.4mm diameter
Steel, 25.4mm diameter
Wheels & Tires
Hubs
Steel
Front: Sealed mech, Rear: Sealed mech, freewheel
Rims
Alex G303, 32-hole/36-hole
Mags
Spokes
14ga. (2.0mm)
—
Spoke Nipples
Brass
—
Front Tire
20 x 2.125" Kenda K-Rad
20 x 2.10" GT Air Bags
Rear Tire
20 x 2.1" Kenda Ko-Rolla
—
Wheel Size
20" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.