Ratio2.75:1
Estimated speed At 90 RPM
Gear
Rear tire: 20×1.75.
Velopedia Bicycle Archive
2000 GT Mach One
Original specifications: 20" wheels · legacy reference geometry.
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No archive photo is available for this record.
At a glance
Archive #46341- Model year
- 2000
- Category
- BMX
- Original MSRP
- $315.00
- Colors
- Black/Glitter Orange, Chrome-Plated, Hot Rod Blue
- Geometry
- Legacy reference
- In this record
- 23 specifications · original MSRP · geometry
Model history 3 other years
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Identification clues
2000 archived details
- Published colors
- Black/Glitter Orange, Chrome-Plated, Hot Rod Blue
- Frame
- 4130 chromoly
- Original equipment
- N/A
Clues, not proof of model year. Colors vary and components may have been replaced.
Original build4130 chromoly · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | 4130 chromoly |
| Fork | GT |
| Fork Material | Chromoly, unicrown crown |
Drivetrain
| Crankset | GT 3-piece chromoly, 44 teeth |
|---|---|
| Bottom Bracket | Three piece, sealed |
| Rear Cogs | 1-speed, 16 teeth |
| Chain | KMC, 1/2 x 3/32" |
| Pedals | GT aluminum platform |
Brakes
| Brakes | Lee Chi linear-pull rear brakes, Lee Chi ProMax rear levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" threadless Aheadset SX-1 |
|---|---|
| Handlebar | GT |
| Handlebar Extensions | Not included |
| Stem | GT Piston |
| Saddle | GT |
| Seatpost | GT aluminum micro-adjust, 26.0mm diameter |
Wheels & Tires
| Hubs | GT 2000 |
|---|---|
| Rims | Weinmann ZAC-X, 36-hole |
| Spokes | 2.0mm |
| Spoke Nipples | Brass nipples |
| Front Tire | 20 x 2.125" GT Brody |
| Rear Tire | 20 x 1.75" GT Brody |
| Wheel Size | 20" wheels |
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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 · 5 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 520.7 mm |
| Head-tube angle | 73° |
| Seat-tube angle | 70° |
| Chainstay / rear center | 357.9 mm |
| Wheelbase | 935.7 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
Lee Chi linear-pull rear brakes
Lee Chi ProMax rear levers
GT aluminum micro-adjust
26.0mm 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
- Front: 20 x 2.125" GT Brody, Rear: 20 x 1.75" GT Brody
- Drivetrain
- 1-speed
- Seatpost diameter
- 26 mm
- Bottom bracket / shell
- Three piece, sealed
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 · Chromoly, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Crankset: GT 3-piece chromoly, 44 teeth · Bottom bracket: Three piece, sealed · Rear cogs: 1-speed, 16 teeth · Chain: KMC, 1/2 x 3/32"
Brakes
Inspect the brakes →Archived: Brakes: Lee Chi linear-pull rear brakes, Lee Chi ProMax rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Weinmann ZAC-X, 36-hole · Hubs: GT 2000 · Front tire: Front: 20 x 2.125" GT Brody, Rear: 20 x 1.75" GT Brody
Controls and contact points
Archived: Headset: 1 1/8" threadless Aheadset SX-1 · Handlebar: GT · Stem: GT Piston · Seatpost: GT aluminum micro-adjust, 26.0mm diameter · Saddle: GT · Pedals: GT aluminum platform
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.