Diamondback Cobra 20

Name: Diamondback Cobra 20
Brand: Diamondback

2017 YouthMountain youth

Fork travel: 40 mm
Wheels: 20″
Drivetrain: 1 × 6 40t / 14–28t
Gear range: 200%
Frame: Steel
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

6 of 22 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

DB Hi-Ten Jr Boy's 20" Mountain Frame Not identified

Suspension

1 part

Fork
- Zoom

Drivetrain

6 parts

Bottom bracket

Square Taper - 5pc Not identified
Cassette
- Shimano MF-TZ20 14–28t
MF-TZ20
Chain
- KMC
Crankset

140mm One-piece Steel, 40 Tooth w/ Double Guard Not identified
Rear derailleur
- Shimano
TZ-20
Shifters
- Shimano

Brakes

2 parts

Brake levers

Alloy Linear Pull w/ Reach Adjust Not identified
Brakes

Alloy Linear Pull Not identified

Wheels and tires

5 parts

Front hub

36h Steel Nutted Not identified
Rear hub

36h Steel Nutted, Freewheel Not identified
Rims

36h 20" R-1000 Alloy Not identified

R-1000
Spokes

14g Steel Not identified
Tires

Jr ATB Knobby, 20x2.0" Not identified

Cockpit and contact points

7 parts

Grips

DB Kraton Not identified
Handlebar

Steel Jr Riser Not identified
Headset

Threaded 1" Not identified
Pedals

Resin MTB, 1/2" Not identified
Saddle

JR ATB 2-panel Not identified
Seatpost
- Pillar
Stem

Steel Quill Not identified

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 20"

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Frame
Top tube lengthmm	406
Seat tube lengthmm	279
Head tube lengthmm	101.6
Head tube angle	70°
Seat tube angle	74°
Chainstay lengthmm	381
Wheelbasemm	889
Front centermm	508
Bottom bracket dropmm	12.7
Standover heightmm	495
Suspension and parts
Crank lengthmm	140
Handlebar widthmm	540
Stem lengthmm	80
Seatpost lengthmm	280

Not published by the manufacturer: Reach, Stack, Bottom bracket height, Fork rake, Trail, Stack/reach ratio, Front travel, Rear travel, Stem angle and Dropper post travel.

Specifications

Frame and fork

Intended fit: boys
Frame material: Steel

Suspension

Suspension configuration: Hardtail
Front travel: 40 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 6
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 28.6 in
Highest gear: 57.1 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2″
Wheel material: Aluminum
Wheel size: 20″

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

40 mm

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2017
Sample: 41 bicycles with this information
Coverage: 74.5% of the class

Lowest gear

28.6 gear inches

This value is above the central range for this class.

Cohort: Youth / Mountain youth Model year: 2017
Sample: 44 bicycles with this information
Coverage: 80.0% of the class

Highest gear

57.1 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2017
Sample: 44 bicycles with this information
Coverage: 80.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.9 km/h
Highest gear: 21.9 km/h

Total gear range 200%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 28.6–57.1 gear inches
Class reference (p10–p90): 16.5–87.3 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2017
Lowest gear: 44 bicycles with this information, 80.0% of the class
Highest gear: 44 bicycles with this information, 80.0% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2017 builds

Differences across 2017 builds
Specification	This bicycle Diamondback Cobra 20	Diamondback Cobra 24
Drivetrain
Front chainrings	1	3
Smallest chainring	40	24
Largest chainring	40	42
Rear sprockets	6	7
Lowest gear	28.6 in	20.6 in
Highest gear	57.1 in	72.0 in
Other specifications
Wheel size	20″	24″