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 2001 Diamondback Impression.
- Data limitation
Only 2002 Diamondback Impression has enough published drivetrain data for gearing calculations.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.12:1
Estimated speed at 90 RPMGear
Uses front tire 20×1.75; rear size isn’t listed.
Gearing unavailable for this size.
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 Impression
2001 Diamondback Impression
Overview
Model Year
2002
2001
Brand
Diamondback
Diamondback
Model
Impression
Impression
Bicycle Type
Juvenile
Juvenile
Original MSRP
$130.00
$144.99
Colors
Blue, Pink
Black, Chrome-Plated
Sizes
Juvenile
Girls 20"
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Hi-tensile steel
Hi-tensile steel, oversize
Fork
—
Diamondback
Fork Material
Hi-tensile steel, unicrown crown
Hi-tensile steel, oversize, unicrown crown
Drivetrain
Crankset
1-piece 5 1/2", 36 teeth
1-piece steel
Bottom Bracket
Steel
Sealed cartridge, 102mm spindle
BB Shell Width
American
American
Rear Cogs
1-speed, 17 teeth
1-speed, 16 teeth
Chain
KMC Z-410, 1/2 x 1/8"
1/2 x 3/32"
Pedals
Wellgo LU-205
Resin
Brakes
Brakes
Aluminum linear-pull rear brakes, aluminum rear levers
ProMax linear-pull rear brakes, aluminum linear-pull rear levers
Cockpit & Contact Points
Headset
1" steel
1" steel
Handlebar
Steel BMX
Steel, 30mm rise
Handlebar Extensions
—
Not included
Stem
Steel
Diamondback 4-bolt
Saddle
Diamondback BMX
DiamondBack Jr.
Seatpost
Steel, chrome plated, 25.6mm diameter
Steel
Wheels & Tires
Hubs
Front: steel, nutted, Rear: steel, coaster brake
Front: steel, Rear: coaster brake
Rims
Steel, 36-hole
Aluminum, 36-hole
Spokes
Stainless steel, 14ga. (2.0mm) straight gauge
UCP, 2.0mm straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 1.75" Kenda K-63
20 x 2.00" Diamondback
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
71°
—
Seat-tube angle
69°
—
Chainstay / rear center
374.6 mm
—
Wheelbase
894.1 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.