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.
- Data limitation
No geometry is recorded for 2008 Diamondback Reactor Expert.
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
Uses front tire 20×1.75; rear size isn’t listed.
Ratio2.69:1
Estimated speed at 90 RPMGear
Uses front tire 20×1.5; 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.
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
2004 Diamondback Reactor Expert
2008 Diamondback Reactor Expert
Overview
Model Year
2004
2008
Brand
Diamondback
Diamondback
Model
Reactor Expert
Reactor Expert
Bicycle Type
BMX
BMX
Original MSRP
$275.00
$325.00
Colors
Super Nickel
Silver Metallic
Sizes
20"
19.75" top tube
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
7005 aluminum
7005 aluminum
Fork
RMX Pro
Diamondback
Fork Material
CRMO, single crown
Chromoly, unicrown crown
Drivetrain
Component Group
—
BMX Mix
Crankset
Forged alloy, 44 teeth
FSA Newton, 43 teeth
Bottom Bracket
Sealed, tapered spindle
Euro Power Spline
BB Shell Width
68mm English
—
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC Z610, 1/2 x 3/32"
KMC, 1/2 x 3/32"
Pedals
DB Bigfoot, alloy platform
DB Sound Alloy w/replaceable pins
Brakes
Brakes
Tektro alloy rear brakes, Tektro rear levers
Tektro 930 linear brakes, Tektro levers
Cockpit & Contact Points
Headset
1 1/8" FSA
1 1/8" threadless FSA
Handlebar
RMX CrMo
6061 aluminum riser
Handlebar Extensions
—
Not included
Stem
RMX cnc, aluminum
DB Reactor
Saddle
RMX padded
DB Race
Seatpost
Aluminum micro-adjust, 26.8mm diameter
Alloy micro-adjust, 27.2mm diameter
Wheels & Tires
Hubs
Sealed mechanism
Front: Sealed bearing alloy, Rear: Aluminum cassette
Rims
Alex 7X23F, 36-hole
Sun CR-8, 32-hole
Spokes
—
14ga. (2.0mm) straight gauge
Front Tire
20 x 1.75" Tioga Comp III
20 x 1.5" Kenda Small Block Eight
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
73°
—
Seat-tube angle
71°
—
Chainstay / rear center
388.6 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.