- Frame
- Hi-Ten Remington Steel
- Groupset
- Juvenile Mix
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Identity & price
These bicycles are categorized differently: 2010 Diamondback RM20 is Kids; 2003 Diamondback RM20 is BMX.
- Data limitation
No geometry is recorded for 2010 Diamondback RM20.
- Gearing
2010 Diamondback RM20 has a 27% lower climbing ratio than 2003 Diamondback RM20.
A lower ratio gives more mechanical advantage; rear-wheel rollout determines distance per crank turn.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.00:1
Estimated speed at 90 RPMGear
Uses front tire 20×2.125; rear size isn’t listed.
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
2010 Diamondback RM20
2003 Diamondback RM20
Overview
Model Year
2010
2003
Brand
Diamondback
Diamondback
Model
RM20
RM20
Bicycle Type
Juvenile
BMX
Original MSRP
Not documented
$499.99
Colors
Gloss Blue
Fast Black/Silver/Black
Sizes
One Size
Pro
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Hi-Ten Remington Steel
7005 aluminum
Fork Material
Hi-Ten Remington steel, unicrown crown
Carbon fiber composite w/chromoly steerer, unicrown crown
Drivetrain
Component Group
Juvenile Mix
—
Crankset
1-piece steel 140mm, 36 teeth
AC Race 16 3pc, 44 teeth
Bottom Bracket
Loose ball
AC Euro Sealed Bearing
BB Shell Width
—
68mm English
Cassette
Cog
—
Rear Cogs
1-speed, 18 teeth
1-speed, 16 teeth
Chain
—
KMC HP20NP, 1/2 X 3/32"
Pedals
Resin platform
Aluminum
Brakes
Brakes
Alloy Linear Pull/Coaster Brake rear brakes, Alloy linear rear levers
Tektro BX-20 linear-pull rear brakes, Tektro Sabre rear levers
Cockpit & Contact Points
Headset
1" Threaded
1 1/8" threadless aluminum
Handlebar
Hi-Ten 2-piece 24" wide x 6" rise
Chromoly BMX
Handlebar Extensions
Not included
—
Stem
Steel quill
Aluminum
Saddle
DB BMX padded
Diamondback BMX
Seatpost
Steel pillar, 25.4mm diameter
Aluminum, 27.0mm diameter
Wheels & Tires
Hubs
Front: Nutted, Rear: Nutted Coaster
Aluminum
Rims
Alex R-1000, 36-hole
Alex DM-24, 36-hole
Spokes
14ga. (2.0mm)
Stainless steel, straight gauge
Spoke Nipples
—
Brass nipples
Front Tire
20 x 2.125" Comp III style
20 x 2.125" Tioga Comp III
Rear Tire
—
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°
Seat-tube angle
—
71°
Chainstay / rear center
—
393.7 mm
Wheelbase
—
985.5 mm
Fork offset / rake
—
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.