Velopedia Bicycle Archive

1999 Diamondback Impression

Original specifications: 20" wheels · 24.3 lb published weight · legacy reference geometry.

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At a glance

Archive #88235

Model year: 1999
Category: Kids
Original MSRP: $149.99
Sizes: Girls 9.5"
Colors: Pink, Wildberry
Weight: 24.3 lb
Geometry: Legacy reference
In this record: 22 specifications · archived image · original MSRP · geometry

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Identification clues

1999 archived details

Published colors: Pink, Wildberry
Frame: Hi-tensile steel
Original equipment: N/A

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

Original buildHi-tensile steel · 20" wheels

Manufacturer catalog

Published sizes and colors

1 size · 2 colors

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

Girls 9.5"

Published colors

PinkWildberry

Frameset

Frame Construction	TIG-welded
Frame Material	Hi-tensile steel
Fork	Diamondback
Fork Material	Hi-tensile steel, unicrown crown

Drivetrain

Crankset	1-piece 5 1/2", 36 teeth
Bottom Bracket	YST BB 621
BB Shell Width	68mm Threadless
Rear Cogs	1-speed, 16 teeth
Chain	Taya 410, 1/2 x 1/8"
Pedals	Resin

Brakes

Brakes	Lee Chi 890/coaster brake rear brakes, Lee Chi 124A rear levers

Cockpit & Contact Points

Headset	1" YST steel
Handlebar	Diamondback steel
Stem	Diamondback steel
Saddle	Diamondback Junior
Seatpost	Pillar, steel, 22.2mm (7/8 inch) diameter

Wheels & Tires

Hubs	Front: King Kong 337BF, Rear: Kung Ten coaster
Rims	Kin Lin RT-6n, 36-hole
Spokes	Shuhn Lih steel, 2.0mm straight gauge
Spoke Nipples	Brass nipples
Front Tire	20 x 1.75" Diamondback
Wheel Size	20" wheels

Geometry

Legacy reference · 6 measurements

Historical measurements. Frame size unknown.

All geometry measurementsLegacy reference · 6 measurements

Measurement	Legacy reference
Top tube	444.5 mm
Head-tube angle	72°
Seat-tube angle	70°
Chainstay / rear center	381 mm
Wheelbase	863.6 mm
Fork offset / rake	30 mm

Frame size not recorded.

Gearing

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

Pedal cadence

RPM

Speed units

RPM = pedal turns per minute.

Published build36T · 16T · 1-speed

Ratio2.25:1

Estimated speed At 90 RPM Gear11.7 mph

Uses front tire 20×1.75; rear size isn’t listed.

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

Find replacement parts

Original specifications

Front tire · Original

20 x 1.75" Diamondback Replacement search: 20x1.75 bicycle tire Before ordering: Check rim type and tire clearance.

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Seatpost · Original

Pillar

steel, 22.2mm (7/8 inch) 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: 20 x 1.75" Diamondback
Drivetrain: 1-speed
Seatpost diameter: 22.2 mm
Bottom bracket / shell: YST BB 621 · 68mm Threadless

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

1999 Diamondback Impression