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 2008 GT Air.
- Data limitation
Only 2011 GT Air has enough published drivetrain data for gearing calculations.
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.
Gearing unavailable for this size.
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
2008 GT Air
Overview
Model Year
2011
2008
Brand
GT
GT
Model
Air
Air
Bicycle Type
BMX
BMX
Original MSRP
Not documented
$229.99
Colors
Black, Neon Orange
Gray
Sizes
—
One size fits all
Weight
—
—
Frameset
Frame Construction
Steel
TIG-welded
Frame Material
CroMo
GT BMX FS design
Fork
GT Dirt/Street
GT BMX design
Fork Material
—
Chromoly, unicrown crown
Drivetrain
Component Group
BMX Mix
BMX
Crankset
Forged steel, 33T teeth
GT Forged 3pc.
Bottom Bracket
Steel
Steel, ball type
Cassette
Dnp
—
Rear Cogs
13 teeth
1-speed, 16 teeth
Chain
KMC Z510
KMC Z410
Pedals
GT Jump design
GT Jump design, resin
Brakes
Brakes
—
Tektro 907 U-brake brakes, Tektro 319AC levers
Cockpit & Contact Points
Headset
1 1/8" Threadless
1 1/8" TH
Handlebar
GT dirt/street Cr-mo
GT dirt/street Cr-mo
Handlebar Extensions
Not included
Not included
Stem
GT freestyle drop
GT FS design
Saddle
GT Slim Mini Street
GT freestyle
Seatpost
Steel, 25.4mm diameter
Steel
Wheels & Tires
Hubs
Steel
Front: Sealed mech, Rear: Sealed mech, freewheel
Rims
Alex G303, 32-hole/36-hole
Mag
Spokes
14ga. (2.0mm)
—
Spoke Nipples
Brass
—
Front Tire
20 x 2.125" Kenda K-Rad
20" 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.