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 2001 Diamondback Reactor and 1999 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
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
Ratio2.75:1
Speed unavailable: wheel or tire size is missing or unclear.
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
2001 Diamondback Reactor
1999 Diamondback Reactor
Overview
Model Year
2001
1999
Brand
Diamondback
Diamondback
Model
Reactor
Reactor
Bicycle Type
BMX
BMX
Original MSRP
$429.99
$424.99
Colors
Black Eye Blue
Ball-Burnished, Orange
Sizes
Pro
Pro XL
Weight
—
27.8 lb
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
7005 aluminum
6061 T6 aluminum
Fork
Diamondback RMX
Diamondback
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
3-piece chromoly 180mm, 44 teeth
Diamondback, 44 teeth
Bottom Bracket
Sealed
Diamondback
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
Aluminum platform
Platform, aluminum
Brakes
Brakes
Tektro 920A rear brakes, Tektro 311A rear levers
Tektro linear-pull rear brakes, Tektro alloy linear-pull rear levers
Cockpit & Contact Points
Headset
1 1/8" threadless Tange Seiki TG-3
1 1/8" threadless Tioga TG
Handlebar
Chromoly BMX
Diamondback 4130 chromoly
Handlebar Extensions
Not included
—
Stem
Aluminum
Forged alloy ahead
Saddle
RMX padded
Padded saddle
Seatpost
Aluminum micro-adjust, 27.0mm diameter
Alloy, 27.0mm diameter
Wheels & Tires
Hubs
RMX aluminum sealed bearing
Diamondback Slasher
Rims
Alex X-303, 36-hole
Mavic double wall, 36-hole
Spokes
—
Shuhn Lih stainless steel, 2.0mm straight gauge
Spoke Nipples
—
Brass nipples
Front Tire
20 x 2.125" Tioga Comp III
20 x 2.125" Ritchey Speed Max
Rear Tire
20 x 1.75" Tioga Comp III
20 x 1.95" Ritchey Speed Max
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
Head-tube angle
74°
75°
Seat-tube angle
71°
71°
Chainstay / rear center
381 mm
393.7 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.