Ratio2.45:1
Estimated speed At 90 RPM
Gear
Rear tire: 20×1.95.
Velopedia Bicycle Archive
2009 Hoffman Bikes Mantra 18 PL
Original specifications: BMX drivetrain · 20" wheels.
Planning to sell? Draft your listing
No archive photo is available for this record.
At a glance
Archive #19161- Model year
- 2009
- Category
- BMX
- Sizes
- 18" TT
- Colors
- Gray, Deep Purple
- In this record
- 21 specifications
Original build4130 chromoly · BMX · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | 4130 chromoly |
| Fork | Hoffman Fat Free |
| Fork Material | Chromoly, unicrown crown |
Drivetrain
| Component Group | BMX |
|---|---|
| Crankset | 3 Piece Tubular Chromoly, 27 teeth |
| Bottom Bracket | Mid sealed BB |
| Cassette | Cassette driver |
| Rear Cogs | 1-speed, 11 teeth |
| Pedals | Alloy Platform |
Brakes
| Brakes | U-Brake rear brakes, Unspecified rear levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" FSA Impact |
|---|---|
| Handlebar | HB 2-piece full chromoly |
| Handlebar Extensions | Not included |
| Saddle | HB Kevlar |
| Seatpost | Alloy Micro Adjust, 25.4mm diameter |
Wheels & Tires
| Hubs | Front: Alloy 3/8", Rear: Sealed 14mm cassette |
|---|---|
| Rims | Front: Jalco double wall, Rear: Alienation CP, 36-hole |
| Front Tire | 20 x 2.125" HB Skidmark |
| Rear Tire | 20 x 1.95" HB Skidmark |
| 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
Alloy Micro Adjust
25.4mm diameter
1 1/8" FSA Impact
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" HB Skidmark, Rear: 20 x 1.95" HB Skidmark
- Drivetrain
- 1-speed
- Seatpost diameter
- 25.4 mm
- Bottom bracket / shell
- Mid sealed BB
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 Fat Free · Chromoly, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Group: BMX · Crankset: 3 Piece Tubular Chromoly, 27 teeth · Bottom bracket: Mid sealed BB · Cassette: Cassette driver · Rear cogs: 1-speed, 11 teeth
Brakes
Inspect the brakes →Archived: Brakes: U-Brake rear brakes, Unspecified rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Front: Jalco double wall, Rear: Alienation CP, 36-hole · Hubs: Front: Alloy 3/8", Rear: Sealed 14mm cassette · Front tire: Front: 20 x 2.125" HB Skidmark, Rear: 20 x 1.95" HB Skidmark
Controls and contact points
Archived: Headset: 1 1/8" FSA Impact · Handlebar: HB 2-piece full chromoly · Seatpost: Alloy Micro Adjust, 25.4mm diameter · Saddle: HB Kevlar · Pedals: Alloy Platform
Have you owned this model?Help document firsthand fit, ride and maintenance details that may no longer be available.
This archive record has limited published detail. Share what would help another rider understand how this model fit, rode and held up over time. Velopedia reviews every contribution before publication.
Already contributed? Send me a fresh private edit link
For privacy, Velopedia shows the same confirmation whether or not an experience exists.
No recent price sample is available for this bike. Check eBay for matching listings.
Find this bike on eBay
Search eBay US; check the model year, size and installed components. We may earn a commission from purchases.
- Frame
- Chromoly
- Brakes
- Tektro 907 U-brake rear brakes, Tektro 289 rear levers
Same brand and year
Cirrus AL
- Frame
- Chromoly downtube
- Brakes
- Rush U-brake rear brakes, Rush 2-finger rear levers
Same brand and year
Cirrus EL
- Frame
- Chromoly
- Brakes
- Caliper rear brakes, Unspecified rear levers
Same category and period
Fit Bike Co. Edwin Delarosa Str Sig.
Same category and period
Mirraco Black Pearl LTD
- Frame
- Chromoly main triangle
- Brakes
- Tektro 907A U-brake rear brakes, Tektro 274A rear levers
Same category and period
GT Bump
- Frame
- Chromoly
- Brakes
- Tektro FX-15 U-brake rear brakes, Tektro 275A rear levers
Same category and period
GT Calafia
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.