Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Handling
2001 Diamondback Reactor has a 1.0° slacker head-tube angle than 1999 Diamondback Reactor in the archived geometry. Frame size is not identified for 1999 Diamondback Reactor and 2001 Diamondback Reactor.
Fork offset, tire size and wheelbase also affect steering; head angle alone is not a handling verdict.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.75:1
Speed unavailable: wheel or tire size is missing or unclear.
Ratio2.75:1
Estimated speed at 90 RPMGear
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.
Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
Specification
1999 Diamondback Reactor
2001 Diamondback Reactor
Overview
Model Year
1999
2001
Brand
Diamondback
Diamondback
Model
Reactor
Reactor
Bicycle Type
BMX
BMX
Original MSRP
$424.99
$429.99
Colors
Ball-Burnished, Orange
Black Eye Blue
Sizes
Pro XL
Pro
Weight
27.8 lb
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
6061 T6 aluminum
7005 aluminum
Fork
Diamondback
Diamondback RMX
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
Diamondback, 44 teeth
3-piece chromoly 180mm, 44 teeth
Bottom Bracket
Diamondback
Sealed
BB Shell Width
68mm Threadless
—
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC HP-20, 1/2 x 3/32"
KMC HP-20, 1/2 x 3/32"
Pedals
Platform, aluminum
Aluminum platform
Brakes
Brakes
Tektro linear-pull rear brakes, Tektro alloy linear-pull rear levers
Tektro 920A rear brakes, Tektro 311A rear levers
Cockpit & Contact Points
Headset
1 1/8" threadless Tioga TG
1 1/8" threadless Tange Seiki TG-3
Handlebar
Diamondback 4130 chromoly
Chromoly BMX
Handlebar Extensions
—
Not included
Stem
Forged alloy ahead
Aluminum
Saddle
Padded saddle
RMX padded
Seatpost
Alloy, 27.0mm diameter
Aluminum micro-adjust, 27.0mm diameter
Wheels & Tires
Hubs
Diamondback Slasher
RMX aluminum sealed bearing
Rims
Mavic double wall, 36-hole
Alex X-303, 36-hole
Spokes
Shuhn Lih stainless steel, 2.0mm straight gauge
—
Spoke Nipples
Brass nipples
—
Front Tire
20 x 2.125" Ritchey Speed Max
20 x 2.125" Tioga Comp III
Rear Tire
20 x 1.95" Ritchey Speed Max
20 x 1.75" Tioga Comp III
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
Head-tube angle
75°
74°
Seat-tube angle
71°
71°
Chainstay / rear center
393.7 mm
381 mm
Wheelbase
965.2 mm
—
Fork offset / rake
20 mm
—
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run. Legacy reference geometry is model-level historical data whose corresponding frame size is not identified; compare those dimensions as reference values rather than size-normalized fit data.