Rocky Mountain Vertex 20

2015 YouthMountain youth

Fork travel: 50 mm
Wheels: 20″
Drivetrain: 1 × 1 36t / 20t
Gear range: 100%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

15 of 19 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

Rocky Mountain 6061 Series Custom Alloy. Threaded BB. ZeroStack 1-1/8\" Headtube. Fender Mounts. 20\" Kids Geometry. Internal Gear Specific. Not identified

Suspension

1 part

Fork

Spinner Grind Air. 50mm. Air Spring / Hydraulic Lockout / Rebound Not identified

Drivetrain

7 parts

Bottom bracket
- VP
Cassette

20T Sprocket Not identified
Chain
- KMC
Z-1
Crankset
- Rocky Mountain 36t
Front derailleur

None
Rear derailleur

None
Shifters

None

Brakes

2 parts

Brake levers
- Shimano BL-M355
BL-M355
Brakes
- Shimano BR-M355
BR-M355

Wheels and tires

5 parts

Front hub
- SRAM
Rear hub
- SRAM
Rims
- WTB
Spokes

Upc Not identified
Tires
- Kenda

Cockpit and contact points

6 parts

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 13"

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
Top tube lengthmm	500
Seat tube lengthmm	330
Head tube lengthmm	90
Head tube angle	70.5°
Seat tube angle	74°
Chainstay lengthmm	405
Wheelbasemm	968
Front centermm	564
Bottom bracket dropmm	25
Standover heightmm	615

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

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Hardtail
Front travel: 50 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 1
Smallest sprocket: 20
Largest sprocket: 20
Lowest gear: 36.0 in
Highest gear: 36.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: No shifting

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 1.95″
Wheel material: Aluminum
Wheel size: 20″

Technical analysis

2 measures

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

Lowest gear

36.0 gear inches

This value is above the central range for this class.

Cohort: Youth / Mountain youth Model year: 2015
Sample: 43 bicycles with this information
Coverage: 93.4% of the class

Highest gear

36.0 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2015
Sample: 43 bicycles with this information
Coverage: 93.4% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 13.8 km/h
Highest gear: 13.8 km/h

Total gear range 100%

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: 36.0–36.0 gear inches
Class reference (p10–p90): 16.5–91.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2015
Lowest gear: 43 bicycles with this information, 93.4% of the class
Highest gear: 43 bicycles with this information, 93.4% 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 2015 builds

Differences across 2015 builds
Specification	This bicycle Rocky Mountain Vertex 20	Rocky Mountain Vertex 24	Rocky Mountain Vertex 930	Rocky Mountain Vertex 950	Rocky Mountain Vertex 950 RSL	Rocky Mountain Vertex 970 RSL
Frame
Frame material	Aluminum	Aluminum	Aluminum	Aluminum	Carbon	Carbon
Suspension
Front travel	50 mm	65 mm	100 mm	100 mm	100 mm	100 mm
Drivetrain
Front chainrings	1	3	3	2	2	2
Smallest chainring	36	24	24	24	24	24
Largest chainring	36	42	42	38	38	38
Rear sprockets	1	9	10	10	10	10
Smallest sprocket	20	11	11	11	11	11
Largest sprocket	20	32	36	36	36	36
Lowest gear	36.0 in	21.8 in	19.3 in	19.3 in	19.3 in	19.3 in
Highest gear	36.0 in	110.7 in	110.7 in	100.2 in	100.2 in	100.2 in
Cockpit
Shifting	No shifting	Mechanical	Mechanical	Mechanical	Mechanical	Mechanical
Other specifications
Bottom bracket standard	BSA	BSA	BB86/BB92	Not informed	Not informed	Not informed
Fork spring	Air	Air	Air	Not informed	Not informed	Not informed
Tire width	1.95″	2″	2.2″	2.2″	2.2″	2.2″
Wheel size	20″	29″	29″	29″	29″	29″