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.
- Handling
1998 GT Aggressor has a 0.5° slacker head-tube angle than 1999 GT Aggressor in the archived geometry. Frame size is not identified for 1998 GT Aggressor and 1999 GT Aggressor.
Fork offset, tire size and wheelbase also affect steering; head angle alone is not a handling verdict.
- Data limitation
Only 1998 GT Aggressor 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.
Lowest0.86:1Highest4.18:1Total range488%
Estimated speed at 90 RPMLowest gearHighest gear
Uses front tire 26×2.1; rear size isn’t listed.
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
1998 GT Aggressor
1999 GT Aggressor
Overview
Model Year
1998
1999
Brand
GT
GT
Model
Aggressor
Aggressor
Bicycle Type
Mountain bike, front suspension
Mountain bike, front suspension
Original MSRP
$392.00
$386.94
Colors
Black, Orange
H.O.T. Black, H.O.T. Red
Sizes
12.5", 14.5", 16", 18", 19", 20"
12.5", 14.5", 16", 18", 20"
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Chromoly
7000 aluminum, butted
Fork
RST 261
SR Suntour MG80, 2.5" travel
Fork Material
Chromoly, triple-clamp crown
Chromoly/magnesium, triple-clamp crown
Drivetrain
Component Group
Mountain Mix
Mountain Mix
Shifters
Shimano Alivio RapidFire Plus
Shimano Altus EZ Fire Plus
Front Derailleur
Shimano Altus top-swing
Shimano AceraX top-swing
Rear Derailleur
Shimano Alivio
Shimano Alivio
Crankset
SR/Suntour XR25, 24/34/46 teeth
SR XR27
Bottom Bracket
Shimano BB-LP27
Shimano cartridge
BB Shell Width
68mm English
68mm English
Rear Cogs
7-speed, 11 - 28 teeth
7-speed, 14 - 28 teeth
Chain
Shimano CN-UG50, 1/2 x 3/32"
Shimano CN-UG50, 1/2 x 3/32"
Pedals
Resin
GT nylon ATB
Brakes
Brakes
Dia-Compe VC-757 brakes, Dia-Compe DP-7 levers
ProMax linear-pull brakes, Shimano Altus levers
Cockpit & Contact Points
Headset
1 1/8" sealed
1 1/8" sealed mechanism
Handlebar
Flat
Flat
Handlebar Extensions
Not included
Not included
Stem
GT hi-rise
GT hi-rise
Saddle
GT
GT
Seatpost
Aluminum micro-adjust, 26.8mm diameter
Aluminum micro-adjust
Wheels & Tires
Hubs
Aluminum, Q/R
Front: aluminum, Q/R, Rear: Shimano 7-speed cassette
Rims
Weinmann 519, 36-hole
Weinmann 519
Spokes
Stainless steel, 2.0mm straight gauge
Stainless steel, 2.0mm straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
26 x 2.10" knobby
26 x 2.10" WTB VelociRaptor
Wheel Size
26" wheels
26" wheels
Geometry · choose a size for each bicycle
Geometry size
Head-tube angle
70°
70.5°
Seat-tube angle
73.5°
73.5°
Chainstay / rear center
420 mm
426 mm
Wheelbase
1059 mm
1070 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.