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 2007 GT Power Series Expert and 2009 GT Power Series Expert.
- Data limitation
Only 2007 GT Power Series Expert 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.
Ratio3.00:1
Speed unavailable: wheel or tire size is missing or unclear.
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
2007 GT Power Series Expert
2009 GT Power Series Expert
Overview
Model Year
2007
2009
Brand
GT
GT
Model
Power Series Expert
Power Series Expert
Bicycle Type
BMX
BMX
Original MSRP
$399.99
$469.99
Colors
Blue/Black
White/Black
Sizes
20" wheel
19.75" TT
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
6061 T6 aluminum
6061-T6 aluminum
Fork
GT BMX design
GT BMX
Fork Material
Aluminum, unicrown crown
Aluminum/chromoly steerer, unicrown crown
Drivetrain
Component Group
BMX Mix
BMX
Crankset
GT forged aluminum 3pc., 42 teeth
GT Tubular Cr-Mo 3pc., 42 teeth
Bottom Bracket
Euro cartridge
Euro Sealed
Cassette
—
Freewheel
Rear Cogs
1-speed, 14 teeth
1-speed, 13, 14, 15, 16, 17, 18 teeth
Chain
KMC Z610
KMC Z610
Pedals
Jr. BMX platform, aluminum
Jr. BMX platform design, aluminum body, cr-mo axle
Brakes
Brakes
Alloy side-pull caliper front/Tektro, 926AL rear brakes, Tektro 316A levers
Tektro 926AL Mini-V rear brakes, Tektro 316A rear levers
Cockpit & Contact Points
Headset
1 1/8" integrated FSA Orbit IS-2
1 1/8" FSA Orbit IS-2
Handlebar
GT BMX aluminum
GT BMX aluminum
Handlebar Extensions
Not included
Not included
Stem
GT BMX Race
GT BMX Race
Saddle
GT Mini
GT Mini BMX
Seatpost
Aluminum, 22.2mm (7/8 inch) diameter
Aluminum, 22.2mm diameter
Wheels & Tires
Hubs
Front: GT BMX sealed, Rear: BMX Race cassette
Front: GT aluminum sealed, Rear: Joy Tech BMX cassette
Rims
Sun M13-II, 32-hole
Alex DA-22, 32-hole
Spokes
15ga. (1.8mm) straight gauge
15ga. (1.8mm)
Spoke Nipples
Aluminum nipples
Aluminum nipples
Front Tire
20 x 1-3/8" Kenda Small Block Eight
20 x 1 3/8" Kenda Small Block Eight
Wheel Size
20" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.