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 1999 GT Pro Series Mini.
- Gearing
1999 GT Pro Series Mini has a 12% lower climbing ratio than 1998 GT Pro Series Mini.
A lower ratio gives more mechanical advantage; rear-wheel rollout determines distance per crank turn.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.69:1
Speed unavailable: wheel or tire size is missing or unclear.
Ratio2.35:1
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
1998 GT Pro Series Mini
1999 GT Pro Series Mini
Overview
Model Year
1998
1999
Brand
GT
GT
Model
Pro Series Mini
Pro Series Mini
Bicycle Type
BMX
BMX
Original MSRP
$329.00
$292.99
Colors
Chrome-plated
Candy Blue, Chrome-Plated
Sizes
Mini
Boys
Weight
—
—
Frameset
Frame Construction
TIG-welded
Welded
Frame Material
4130 chromoly
Chromoly
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT 3-piece jr aluminum, 43 teeth
GT 3-piece aluminum, 40 teeth
Bottom Bracket
Sealed cartridge
Three piece, sealed
Rear Cogs
1-speed, 16 teeth
1-speed, 17 teeth
Chain
1/2 x 1/8"
1/2 x 1/8"
Pedals
Steel cage, resin body
BMX bear trap style, aluminum
Brakes
Brakes
Side-pull rear brakes, Dia-Compe MX-122 levers
Dia-Compe MX122, mini rear brakes, Tektro alloy linear-pull rear levers
Cockpit & Contact Points
Headset
1" threadless Aheadset MX
1" threadless Aheadset
Handlebar
GT Jr aluminum
GT Jr aluminum
Stem
GT Mini Piston
GT Mini Piston
Saddle
GT
Uni mini
Seatpost
GT aluminum
1 pc. seat/alloy post
Wheels & Tires
Hubs
GT Mohawk
GT Mohawk
Rims
Weinmann Zac 2121
Weinmann Mini Zac, 28-hole
Spokes
Steel, 2.0mm straight gauge
1.8mm straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 1 1/8" GT AA Pro
20 x 1 3/8" GT AA Pro
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
72.5°
—
Seat-tube angle
71°
—
Chainstay / rear center
348 mm
—
Wheelbase
863.6 mm
—
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run. Legacy reference geometry is model-level historical data whose corresponding frame size is not identified; compare those dimensions as reference values rather than size-normalized fit data.