Ratio2.57:1
Estimated speed At 90 RPM
Gear
Uses front tire 20×2.1; rear size isn’t listed.
Velopedia Bicycle Archive
2009 GT Slammer
Original specifications: BMX drivetrain · 20" wheels.
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No archive photo is available for this record.
At a glance
Archive #18798- Model year
- 2009
- Category
- BMX
- Original MSRP
- $259.99
- Sizes
- 19.5" TT
- Colors
- Brown/Yellow
- In this record
- 24 specifications · original MSRP
Model history 3 other years
Browse other years
Compare side by side
Identification clues
2009 archived details
- Published colors
- Brown/Yellow
- Frame
- High Tensile Steel
- Original equipment
- BMX
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildHigh Tensile Steel · BMX · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | High Tensile Steel |
| Fork | GT Freestyle |
| Fork Material | High-tensile steel, unicrown crown |
Drivetrain
| Component Group | BMX |
|---|---|
| Crankset | Steel One Piece, 36 teeth |
| Bottom Bracket | Steel |
| Cassette | Freewheel |
| Rear Cogs | 1-speed, 14 teeth |
| Chain | KMC Z510 |
| Pedals | GT Jump design, resin |
Brakes
| Brakes | Tektro 907 U-brake brakes, Tektro 289A levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" TH |
|---|---|
| Handlebar | GT dirt/street Hi-Ten |
| Handlebar Extensions | Not included |
| Stem | GT Freestyle aluminum |
| Saddle | GT freestyle |
| Seatpost | Steel, 25.4mm diameter |
Wheels & Tires
| Hubs | Steel 14mm axle |
|---|---|
| Rims | Alex G303, 48-hole |
| Spokes | 14ga. (2.0mm) |
| Spoke Nipples | Brass |
| Front Tire | 20 x 2.10" GT Air Bags |
| Wheel Size | 20" 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
20 x 2.10" GT Air Bags
Replacement search: 20x2.1 bicycle tire Before ordering: Check rim type and tire clearance.
Steel
25.4mm diameter
Alex G303
48-hole
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
- 20 x 2.10" GT Air Bags
- Drivetrain
- 1-speed
- Seatpost diameter
- 25.4 mm
- Bottom bracket / shell
- Steel
Equipment inspection checks 10 checks based on 5 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: GT Freestyle · High-tensile steel, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Group: BMX · Crankset: Steel One Piece, 36 teeth · Bottom bracket: Steel · Cassette: Freewheel · Rear cogs: 1-speed, 14 teeth · Chain: KMC Z510
Brakes
Inspect the brakes →Archived: Brakes: Tektro 907 U-brake brakes, Tektro 289A levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Alex G303, 48-hole · Hubs: Steel 14mm axle · Front tire: 20 x 2.10" GT Air Bags
Controls and contact points
Archived: Headset: 1 1/8" TH · Handlebar: GT dirt/street Hi-Ten · Stem: GT Freestyle aluminum · Seatpost: Steel, 25.4mm diameter · Saddle: GT freestyle · Pedals: GT Jump design, resin
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- Brakes
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.