Velopedia Bicycle Archive

1999 Diamondback Reactor

Original specifications: 20" wheels · 27.8 lb published weight · legacy reference geometry.

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At a glance

Archive #81267
Model year
1999
Category
BMX
Original MSRP
$424.99
Sizes
Pro XL
Colors
Ball-Burnished, Orange
Weight
27.8 lb
Geometry
Legacy reference
In this record
23 specifications · archived image · original MSRP · geometry
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Identification clues

1999 archived details

Published colors
Ball-Burnished, Orange
Frame
6061 T6 aluminum
Original equipment
N/A

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

Campaign
Original build6061 T6 aluminum · 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

Pro XL

Published colors

Ball-BurnishedOrange

Frameset

Frame ConstructionTIG-welded
Frame Material6061 T6 aluminum
ForkDiamondback
Fork MaterialChromoly, unicrown crown

Drivetrain

CranksetDiamondback, 44 teeth
Bottom BracketDiamondback
BB Shell Width68mm Threadless
Rear Cogs1-speed, 16 teeth
ChainKMC HP-20, 1/2 x 3/32"
PedalsPlatform, aluminum

Brakes

BrakesTektro linear-pull rear brakes, Tektro alloy linear-pull rear levers

Cockpit & Contact Points

Headset1 1/8" threadless Tioga TG
HandlebarDiamondback 4130 chromoly
StemForged alloy ahead
SaddlePadded saddle
SeatpostAlloy, 27.0mm diameter

Wheels & Tires

HubsDiamondback Slasher
RimsMavic double wall, 36-hole
SpokesShuhn Lih stainless steel, 2.0mm straight gauge
Spoke NipplesBrass nipples
Front Tire20 x 2.125" Ritchey Speed Max
Rear Tire20 x 1.95" Ritchey Speed Max
Wheel Size20" wheels

Geometry

Legacy reference · 6 measurements

Historical measurements. Frame size unknown.

All geometry measurementsLegacy reference · 6 measurements
MeasurementLegacy reference
Top tube533.4 mm
Head-tube angle75°
Seat-tube angle71°
Chainstay / rear center393.7 mm
Wheelbase965.2 mm
Fork offset / rake20 mm

Frame size not recorded.

Gearing

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

Published build44T · 16T · 1-speed
Ratio2.75:1

Speed unavailable: wheel or tire size is missing or unclear.

Add your rear tire size to calculate speed
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.

Your gearing setup
Gears

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

Rear tire

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).

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.

Gear, dimension and cadence changes update results automatically.

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 2.125" Ritchey Speed Max
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Brake pads · Original
Tektro linear-pull rear brakes

Tektro alloy linear-pull rear levers

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Seatpost · Original
Alloy

27.0mm diameter

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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" Ritchey Speed Max, Rear: 20 x 1.95" Ritchey Speed Max
Drivetrain
1-speed
Seatpost diameter
27 mm
Bottom bracket / shell
Diamondback · 68mm Threadless
Campaign
Equipment inspection checks 10 checks based on 5 archived component groups Open equipment checksClose equipment checks
0 of 10 checked Progress stays in this browser for this record.

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: Diamondback · Chromoly, unicrown crown

Drivetrain

Check drivetrain wear →

Archived: Crankset: Diamondback, 44 teeth · Bottom bracket: Diamondback · Rear cogs: 1-speed, 16 teeth · Chain: KMC HP-20, 1/2 x 3/32"

Brakes

Inspect the brakes →

Archived: Brakes: Tektro linear-pull rear brakes, Tektro alloy linear-pull rear levers

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 20" wheels · Rims: Mavic double wall, 36-hole · Hubs: Diamondback Slasher · Front tire: Front: 20 x 2.125" Ritchey Speed Max, Rear: 20 x 1.95" Ritchey Speed Max

Controls and contact points

Archived: Headset: 1 1/8" threadless Tioga TG · Handlebar: Diamondback 4130 chromoly · Stem: Forged alloy ahead · Seatpost: Alloy, 27.0mm diameter · Saddle: Padded saddle · Pedals: Platform, aluminum

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

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