Lowest0.86:1
Highest3.82:1
Total range445%
Estimated speed At 90 RPM
Lowest gear
Highest gear
Uses front tire 700C×40; rear size isn’t listed.
Velopedia Bicycle Archive
1999 GT Airstream
Original specifications: Shimano Alivio · 7-speed · mechanical rear derailleur · 700c wheels.
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At a glance
Archive #81678- Model year
- 1999
- Category
- Hybrid
- Original MSRP
- $386.99
- Sizes
- 14", 16", 18", 20", 22", womens 16", womens 18", womens 20"
- Colors
- Glacier Blue (womens), Horizon Purple (mens, Womens), Pewter Smoke (mens)
- In this record
- 25 specifications · archived image · original MSRP
Original buildChromoly, butted mainframe · Hybrid Mix · 700c wheels
Frameset
| Frame Construction | Welded |
|---|---|
| Frame Material | Chromoly, butted mainframe |
| Fork | RST 700, 1.6" travel |
| Fork Material | Aluminum/chromoly |
Drivetrain
| Component Group | Hybrid Mix |
|---|---|
| Shifters | Grip Shift MRX |
| Front Derailleur | Shimano Altus |
| Rear Derailleur | Shimano Alivio |
| Crankset | Shimano Altus, 24/34/42 teeth |
| Bottom Bracket | Shimano BB-CT91 |
| Rear Cogs | 7-speed, 11 - 28 teeth |
| Chain | Shimano CN-UG50, 1/2 x 3/32" |
| Pedals | Resin |
Brakes
| Brakes | Shimano Altus brakes, alloy levers |
|---|
Cockpit & Contact Points
| Headset | 1" sealed mechanism |
|---|---|
| Handlebar | High-rise steel |
| Handlebar Extensions | Not included |
| Stem | Aluminum, high rise |
| Saddle | GT |
| Seatpost | Kalloy aluminum suspension, adjustable |
Wheels & Tires
| Hubs | Shimano Altus |
|---|---|
| Rims | Araya PX-645, 36-hole |
| Spokes | Stainless steel, 2.0mm straight gauge |
| Front Tire | 700 x 40c multi-terrain |
| Wheel Size | 700c wheels |
No specifications match. Try a component name or clear your search.
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
700 x 40c multi-terrain
Replacement search: 700cx40 bicycle tire Before ordering: Check rim type and tire clearance.
Shimano BB-CT91
More parts (4)Fewer parts
Shimano Altus
24/34/42 teeth
Shimano Altus
Shimano Alivio
Shimano Altus
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
- 700 x 40c multi-terrain
- Drivetrain
- 7-speed
- Bottom bracket / shell
- Shimano BB-CT91
Equipment inspection checks 11 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: Welded · Fork: RST 700, 1.6" travel · Aluminum/chromoly
Suspension
Evaluate the suspension →Archived: Fork: RST 700, 1.6" travel
Drivetrain
Check drivetrain wear →Archived: Group: Hybrid Mix · Shifters: Grip Shift MRX · Front derailleur: Shimano Altus · Rear derailleur: Shimano Alivio · Crankset: Shimano Altus, 24/34/42 teeth · Bottom bracket: Shimano BB-CT91 · Rear cogs: 7-speed, 11 - 28 teeth · Chain: Shimano CN-UG50, 1/2 x 3/32"
Brakes
Inspect the brakes →Archived: Brakes: Shimano Altus brakes, alloy levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 700c wheels · Rims: Araya PX-645, 36-hole · Hubs: Shimano Altus · Front tire: 700 x 40c multi-terrain
Controls and contact points
Archived: Headset: 1" sealed mechanism · Handlebar: High-rise steel · Stem: Aluminum, high rise · Seatpost: Kalloy aluminum suspension, adjustable · Saddle: GT · Pedals: Resin
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.