Velopedia Bicycle Archive

2009 Diamondback Nitrus

Original specifications: BMX drivetrain · 20" wheels.

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At a glance

Archive #18992

Model year: 2009
Category: BMX
Sizes: 20.25" TT
Colors: Black/Red
In this record: 23 specifications · archived image

Model history 7 other years

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Identification clues

2009 archived details

Published colors: Black/Red
Frame: 6061-T6 aluminum
Original equipment: BMX

Clues, not proof of model year. Colors vary and components may have been replaced.

Original build6061-T6 aluminum · BMX · 20" wheels

Historical catalog variants

Archived sizes and colors

1 item record

Item-level catalog entries recovered from Velopedia’s original bicycle archive. They document how this model was listed historically; they do not identify the frame size associated with legacy reference geometry or indicate current availability.

Published sizes

20.25" TT

Published colors

Black/Red

View 1 archived size/color combination

Size	Color
20.25" TT	Black/Red

Historical catalog evidence. Exact specifications and naming may vary by market, production run or manufacturer revision.

Frameset

Frame Construction	TIG-welded
Frame Material	6061-T6 aluminum
Fork Material	Hi-tensile steel/chromoly steerer, unicrown crown

Drivetrain

Component Group	BMX
Crankset	3-Piece Tubular Chromoly 175mm, 44 teeth
Bottom Bracket	Loose ball w/ 8 spline
Cassette	Freewheel
Rear Cogs	1-speed, 16 teeth
Chain	KMC Z410, 1/2 x 1/8"
Pedals	DB Sound alloy w/traction pins

Brakes

Brakes	Tektro linear rear brakes, Tektro rear levers

Cockpit & Contact Points

Headset	1 1/8" FSA Threadless
Handlebar	Hi-Ten 2-piece
Handlebar Extensions	Not included
Stem	DB Reactor
Saddle	DB BMX padded
Seatpost	Alloy Micro Adjust, 26.8mm diameter

Wheels & Tires

Hubs	Aluminum 3/8" axle
Rims	Aluminum, 36-hole
Spokes	14ga. (2.0mm)
Front Tire	20 x 2.125" Comp III style
Rear Tire	20 x 1.75" Comp III style
Wheel Size	20" wheels

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

Pedal cadence

RPM

Speed units

RPM = pedal turns per minute.

Published build44T · 16T · 1-speed

Ratio2.75:1

Estimated speed At 90 RPM Gear14.4 mph

Rear tire: 20×1.75.

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 other gearing

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Gears Drivetrain

Front teeth Smallest rear teeth Largest rear teeth

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Rear tire marking

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

Rim diameter (BSD, mm) Tire width (mm)

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Cadence (RPM) Speed units

Gear, dimension and cadence changes update results automatically.

Gearing comparison
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

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Original specifications

Seatpost · Original

Alloy Micro Adjust

26.8mm diameter

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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" Comp III style, Rear: 20 x 1.75" Comp III style
Drivetrain: 1-speed
Seatpost diameter: 26.8 mm
Bottom bracket / shell: Loose ball w/ 8 spline

Equipment inspection checks 9 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: · Hi-tensile steel/chromoly steerer, unicrown crown

Look for dents or shape changes and inspect the edges of welds around the head tube, bottom bracket, seat cluster and suspension mounts for hairline cracks.

Drivetrain

Check drivetrain wear →

Archived: Group: BMX · Crankset: 3-Piece Tubular Chromoly 175mm, 44 teeth · Bottom bracket: Loose ball w/ 8 spline · Cassette: Freewheel · Rear cogs: 1-speed, 16 teeth · Chain: KMC Z410, 1/2 x 1/8"

Check chain tension and chainline, rotate the drivetrain through a full revolution and confirm the rear axle or tensioning hardware cannot slip.
Measure chain wear with a compatible gauge and inspect chainring, cassette or freewheel teeth. A new chain does not rule out wear in the remaining drivetrain.
Turn the cranks slowly, feel for rough bearings and check for side-to-side play. Inspect crank arms, chainring bolts and pedal threads for looseness or damage.

Brakes

Inspect the brakes →

Archived: Brakes: Tektro linear rear brakes, Tektro rear levers

Inspect pads and braking surfaces, check the complete cable or hose path, and confirm both controls feel consistent and return cleanly.

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 20" wheels · Rims: Aluminum, 36-hole · Hubs: Aluminum 3/8" axle · Front tire: Front: 20 x 2.125" Comp III style, Rear: 20 x 1.75" Comp III style

Spin both wheels and watch for side-to-side and vertical movement. Check spoke tension, rim condition and hub play.
Inspect both tire casings for cuts, cracking, plugs, bulges or exposed threads and confirm the installed sizes are safe for the rims and available frame and fork clearance.

Controls and contact points

Archived: Headset: 1 1/8" FSA Threadless · Handlebar: Hi-Ten 2-piece · Stem: DB Reactor · Seatpost: Alloy Micro Adjust, 26.8mm diameter · Saddle: DB BMX padded · Pedals: DB Sound alloy w/traction pins

Apply the front brake and rock the bike to check for headset play or notchiness. Inspect the stem, handlebar and clamp zones, then confirm every fastener and control is secure.
Check that the seatpost moves for adjustment and that the saddle, post and clamp hold securely without cracks, severe corrosion or damaged hardware.

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

2009 Diamondback Nitrus