Ratio2.75:1
Estimated speed At 90 RPM
Gear
Uses front tire 20×2.125; rear size isn’t listed.
Velopedia Bicycle Archive
2003 Hoffman Bikes Flow
Original specifications: 20" wheels · 36 lb published weight · legacy reference geometry.
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At a glance
Archive #38848- Model year
- 2003
- Category
- BMX
- Original MSRP
- $250.00
- Sizes
- Pro
- Colors
- Black, Gray, Vivid Green
- Weight
- 36 lb
- Geometry
- Legacy reference
- In this record
- 22 specifications · archived image · original MSRP · geometry
Original build4130 chromoly main triangle/hi-tensile steel rear stays · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | 4130 chromoly main triangle/hi-tensile steel rear stays |
| Fork | Hoffman Prodigy |
| Fork Material | 4130 chromoly |
Drivetrain
| Crankset | 1-piece chromoly 175mm, 44 teeth |
|---|---|
| Bottom Bracket | One piece |
| Rear Cogs | 1-speed, 16 teeth |
| Chain | KMC 410, 1/2 x 1/8" |
| Pedals | Wellgo LU-313 |
Brakes
| Brakes | Tektro 906A U-brake rear brakes, Dia-Compe MX-101 rear levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" threadless Cane Creek |
|---|---|
| Handlebar | Hoffman Prodigy |
| Handlebar Extensions | Not included |
| Stem | Hoffman SuperStem |
| Saddle | Hoffman Padded Embossed Skull |
| Seatpost | Hoffman Prodigy, 25.4mm diameter |
Wheels & Tires
| Hubs | Keyin alloy 14mm |
|---|---|
| Rims | Jalco, 48-hole |
| Spokes | Steel, 14ga. (2.0mm) straight gauge |
| Spoke Nipples | Aluminum nipples |
| Front Tire | 20 x 2.125" Duro Knobby |
| Wheel Size | 20" 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 · 6 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 508 mm |
| Head-tube angle | 74° |
| Seat-tube angle | 70° |
| Chainstay / rear center | 360.7 mm |
| Wheelbase | 914.4 mm |
| Fork offset / rake | 35.6 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
20 x 2.125" Duro Knobby
Replacement search: 20x2.125 bicycle tire Before ordering: Check rim type and tire clearance.
Wellgo LU-313
Hoffman Prodigy
25.4mm 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
- 20 x 2.125" Duro Knobby
- Drivetrain
- 1-speed
- Seatpost diameter
- 25.4 mm
- Bottom bracket / shell
- One piece
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: Hoffman Prodigy · 4130 chromoly
Drivetrain
Check drivetrain wear →Archived: Crankset: 1-piece chromoly 175mm, 44 teeth · Bottom bracket: One piece · Rear cogs: 1-speed, 16 teeth · Chain: KMC 410, 1/2 x 1/8"
Brakes
Inspect the brakes →Archived: Brakes: Tektro 906A U-brake rear brakes, Dia-Compe MX-101 rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Jalco, 48-hole · Hubs: Keyin alloy 14mm · Front tire: 20 x 2.125" Duro Knobby
Controls and contact points
Archived: Headset: 1 1/8" threadless Cane Creek · Handlebar: Hoffman Prodigy · Stem: Hoffman SuperStem · Seatpost: Hoffman Prodigy, 25.4mm diameter · Saddle: Hoffman Padded Embossed Skull · Pedals: Wellgo LU-313
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.