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 2008 GT Power Series Expert and 2007 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.
Gearing unavailable for this size.
Ratio3.00:1
Speed unavailable: wheel or tire size is missing or unclear.
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
2008 GT Power Series Expert
2007 GT Power Series Expert
Overview
Model Year
2008
2007
Brand
GT
GT
Model
Power Series Expert
Power Series Expert
Bicycle Type
BMX
BMX
Original MSRP
$399.99
$399.99
Colors
Silver/Black
Blue/Black
Sizes
Expert 19.75"TT
20" wheel
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
GT 6061 Aluminum
6061 T6 aluminum
Fork
GT Aluminum
GT BMX design
Fork Material
Aluminum, unicrown crown
Aluminum, unicrown crown
Drivetrain
Component Group
BMX
BMX Mix
Crankset
GT forged aluminum 3pc.
GT forged aluminum 3pc., 42 teeth
Bottom Bracket
Euro
Euro cartridge
Rear Cogs
1-speed, 14, 15, 16 teeth
1-speed, 14 teeth
Chain
KMC Z610
KMC Z610
Pedals
Jr. BMX platform, aluminum
Jr. BMX platform, aluminum
Brakes
Brakes
—
Alloy side-pull caliper front/Tektro, 926AL rear brakes, Tektro 316A levers
Cockpit & Contact Points
Headset
1 1/8" FSA Orbit IS-2
1 1/8" integrated 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 BMX
GT Mini
Seatpost
Aluminum
Aluminum, 22.2mm (7/8 inch) diameter
Wheels & Tires
Hubs
Front: GT aluminum sealed, Rear: Joy Tech cassette
Front: GT BMX sealed, Rear: BMX Race cassette
Rims
Alex DA-22, 32-hole
Sun M13-II, 32-hole
Spokes
15ga. (1.8mm)
15ga. (1.8mm) straight gauge
Spoke Nipples
Aluminum nipples
Aluminum nipples
Front Tire
20" 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.