Lowest0.86:1
Highest4.18:1
Total range488%
Estimated speed At 90 RPM
Lowest gear
Highest gear
Uses front tire 26×2.1; rear size isn’t listed.
Velopedia Bicycle Archive
1998 GT Aggressor
Original specifications: Shimano Alivio · 7-speed · mechanical rear derailleur · 26" wheels · legacy reference geometry.
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At a glance
Archive #75114- Model year
- 1998
- Category
- Mountain
- Original MSRP
- $392.00
- Sizes
- 12.5", 14.5", 16", 18", 19", 20"
- Colors
- Black, Orange
- Geometry
- Legacy reference
- In this record
- 27 specifications · archived image · original MSRP · geometry
Model history 10 other years
Browse other years
Compare side by side
Identification clues
1998 archived details
- Published colors
- Black, Orange
- Frame
- Chromoly
- Original equipment
- Mountain Mix
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildChromoly · Mountain Mix · 26" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | Chromoly |
| Fork | RST 261 |
| Fork Material | Chromoly, triple-clamp crown |
Drivetrain
| Component Group | Mountain Mix |
|---|---|
| Shifters | Shimano Alivio RapidFire Plus |
| Front Derailleur | Shimano Altus top-swing |
| Rear Derailleur | Shimano Alivio |
| Crankset | SR/Suntour XR25, 24/34/46 teeth |
| Bottom Bracket | Shimano BB-LP27 |
| BB Shell Width | 68mm English |
| Rear Cogs | 7-speed, 11 - 28 teeth |
| Chain | Shimano CN-UG50, 1/2 x 3/32" |
| Pedals | Resin |
Brakes
| Brakes | Dia-Compe VC-757 brakes, Dia-Compe DP-7 levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" sealed |
|---|---|
| Handlebar | Flat |
| Handlebar Extensions | Not included |
| Stem | GT hi-rise |
| Saddle | GT |
| Seatpost | Aluminum micro-adjust, 26.8mm diameter |
Wheels & Tires
| Hubs | Aluminum, Q/R |
|---|---|
| Rims | Weinmann 519, 36-hole |
| Spokes | Stainless steel, 2.0mm straight gauge |
| Spoke Nipples | Brass nipples |
| Front Tire | 26 x 2.10" knobby |
| Wheel Size | 26" wheels |
No specifications match. Try a component name or clear your search.
Geometry
Historical measurements. Frame size unknown.
Reference drawing
Size
Measurement
Measurement
—
Select an available measurement to locate it on the frame.
All geometry measurementsLegacy reference · 4 measurements
| Measurement | Legacy reference |
|---|---|
| Head-tube angle | 70° |
| Seat-tube angle | 73.5° |
| Chainstay / rear center | 420 mm |
| Wheelbase | 1059 mm |
Frame size not recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
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.
Try your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts
26 x 2.10" knobby
Replacement search: 26x2.1 bicycle tire Before ordering: Check rim type and tire clearance.
Shimano BB-LP27
More parts (4)Fewer parts
Shimano Altus top-swing
Shimano Alivio
Shimano Alivio RapidFire Plus
Aluminum micro-adjust
26.8mm diameter
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Parts and service referenceQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Front tire
- 26 x 2.10" knobby
- Drivetrain
- 7-speed
- Seatpost diameter
- 26.8 mm
- Bottom bracket / shell
- Shimano BB-LP27 · 68mm English
Equipment inspection checks 12 checks based on 6 archived component groups Open equipment checksClose equipment checks
Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.
Full used-bike inspection guide →
Frame and fork
Inspect the frame and fork →Archived: Frame: TIG-welded · Fork: RST 261 · Chromoly, triple-clamp crown
Suspension
Evaluate the suspension →Archived: Fork: RST 261
Drivetrain
Check drivetrain wear →Archived: Group: Mountain Mix · Shifters: Shimano Alivio RapidFire Plus · Front derailleur: Shimano Altus top-swing · Rear derailleur: Shimano Alivio · Crankset: SR/Suntour XR25, 24/34/46 teeth · Bottom bracket: Shimano BB-LP27 · Rear cogs: 7-speed, 11 - 28 teeth · Chain: Shimano CN-UG50, 1/2 x 3/32"
Brakes
Inspect the brakes →Archived: Brakes: Dia-Compe VC-757 brakes, Dia-Compe DP-7 levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 26" wheels · Rims: Weinmann 519, 36-hole · Hubs: Aluminum, Q/R · Front tire: 26 x 2.10" knobby
Controls and contact points
Archived: Headset: 1 1/8" sealed · Handlebar: Flat · Stem: GT hi-rise · Seatpost: Aluminum micro-adjust, 26.8mm diameter · Saddle: GT · Pedals: Resin
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Market Snapshot
Checked Nov 8, 2026We may earn a commission from purchases through these eBay links.
GT Aggressor 26 in MTB 18 in Frame Silver Front Suspension Mech Disc Riser
Used · Fixed price · offers accepted · USD 300.00
Seller size: 18 in
Model year not confirmed
GT Aggressor 26in M Mountain Bike Black/Pink Front Suspension Mech Disc 3x7
Used · Fixed price · offers accepted · USD 200.00
Seller size: M
Model year not confirmed
Model-family used asking$340.32Median asking · middle 50% $226.24–$449.88 · 24 listings
Model-family new asking$400.00Median asking · middle 50% $250.00–$500.00 · 5 listings
Price history
Model-family used asking prices
View observation data
| Observed | Median | Middle 50% | Matches |
|---|---|---|---|
| Nov 8, 2026 | $340.32 | $226.24–$449.88 | 24 |
| Nov 3, 2026 | $340.64 | $229.99–$445.00 | 21 |
| Sep 29, 2026 | $355.40 | $245.00–$462.50 | 20 |
| Sep 18, 2026 | $340.00 | $229.99–$500.00 | 17 |
| Sep 16, 2026 | $332.50 | $203.75–$500.00 | 18 |
| Sep 14, 2026 | $300.00 | $207.50–$500.00 | 19 |
| Sep 9, 2026 | $320.00 | $211.25–$500.00 | 20 |
| Sep 2, 2026 | $340.00 | $215.00–$550.00 | 19 |
Asking prices, not completed sales. Shipping and tax excluded.
Find this bike on eBay
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.