Velopedia Bicycle Archive
Compare Bicycles
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.
No key difference could be established from the available data. Check the full table for the details.
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
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
2002 Diamondback RM20
2003 Diamondback RM20
Overview
Model Year
2002
2003
Brand
Diamondback
Diamondback
Model
RM20
RM20
Bicycle Type
BMX
BMX
Original MSRP
$500.00
$499.99
Colors
Red/White
Fast Black/Silver/Black
Sizes
Pro
Pro
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
7005 aluminum
7005 aluminum
Fork Material
Chromoly, unicrown crown
Carbon fiber composite w/chromoly steerer, unicrown crown
Drivetrain
Crankset
AC Race 16 3pc, 44 teeth
AC Race 16 3pc, 44 teeth
Bottom Bracket
AC Euro Sealed Bearing
AC Euro Sealed Bearing
BB Shell Width
68mm English
68mm English
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC HP20NP, 1/2 X 3/32"
KMC HP20NP, 1/2 X 3/32"
Pedals
Aluminum
Aluminum
Brakes
Brakes
Tektro BX-20 linear-pull rear brakes, Tektro Sabre rear levers
Tektro BX-20 linear-pull rear brakes, Tektro Sabre rear levers
Cockpit & Contact Points
Headset
1 1/8" threadless aluminum
1 1/8" threadless aluminum
Handlebar
Chromoly BMX
Chromoly BMX
Stem
Aluminum
Aluminum
Saddle
Diamondback BMX
Diamondback BMX
Seatpost
Aluminum, 27.0mm diameter
Aluminum, 27.0mm diameter
Wheels & Tires
Hubs
Aluminum
Aluminum
Rims
Alex Supra B Pro, 36-hole
Alex DM-24, 36-hole
Spokes
Stainless steel, 14ga. (2.0mm) straight gauge
Stainless steel, straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 2.125" Tioga Comp III
20 x 2.125" Tioga Comp III
Rear Tire
20 x 1.75" Tioga Comp III
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
73.5°
73.5°
Seat-tube angle
71°
71°
Chainstay / rear center
393.7 mm
393.7 mm
Wheelbase
985.5 mm
985.5 mm
Fork offset / rake
30.5 mm
30.5 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.