Rocky Mountain Vertex Jr 20 SunRace

2023 YouthMountain youth Manufacturer page

Rocky Mountain Vertex Jr 20 SunRace, color Orange / Black

Last known price: $859

Prices shown first for United States
Fork travel: 80 mm
Wheels: 20″
Drivetrain: 1 × 9 28t / 11–42t
Gear range: 382%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

kids

The manufacturer did not publish rider heights for these sizes.

Components

17 of 20 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 SL Alloy | Threaded BB | Zero Stack Headtube | 20" Kid's Geometry Rear Triangle Not identified

Suspension

1 part

Fork
- SR Suntour

Drivetrain

6 parts

Bottom bracket

Sealed Cartridge Bearing Not identified
Cassette
- SunRace 11–42t
Chain
- KMC X9 9 speeds
Crankset
- Rocky Mountain 28t
Rear derailleur
- SunRace
Shifters
- SunRace

Brakes

1 part

Brakes
- Shimano

Wheels and tires

5 parts

Front hub
- Shimano HB-TX505
HB-TX505
Rear hub
- Shimano FH-TX505 11 speeds
FH-TX505
Rims
- Rocky Mountain
Spokes

2.0 Stainless Not identified
Tires
- Kenda Amrak

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 kids

Table

Reach 323mm

Stack 428mm

Wheelbase 872mm

Head angle 68.0°

Seat angle 71.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 20″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	323
Stackmm	428
Top tube lengthmm	470
Seat tube lengthmm	255
Head tube lengthmm	100
Head tube angle	68°
Seat tube angle	71°
Chainstay lengthmm	347
Wheelbasemm	872
Front centermm	526
Bottom bracket dropmm	15
Standover heightmm	550
Fork rakemm	33
Stack/reach ratio	1.33

Not published by the manufacturer: Bottom bracket height, Trail, 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: 80 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 28
Largest chainring: 28
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 42
Lowest gear: 13.3 in
Highest gear: 50.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.4″
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.

Lowest gear

13.3 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2023
Sample: 345 bicycles with this information
Coverage: 81.5% of the class

Highest gear

50.9 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2023
Sample: 345 bicycles with this information
Coverage: 81.5% of the class

Shifting

Mechanical

20 of 423 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2023
Sample: 423 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 5.1 km/h
Highest gear: 19.5 km/h

Total gear range 382%

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: 13.3–50.9 gear inches
Class reference (p10–p90): 14.0–78.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2023
Lowest gear: 345 bicycles with this information, 81.5% of the class
Highest gear: 345 bicycles with this information, 81.5% 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 2023 builds

Differences across 2023 builds
Specification	This bicycle Rocky Mountain Vertex Jr 20 SunRace	Rocky Mountain Vertex Jr 20	Rocky Mountain Vertex Jr 24	Rocky Mountain Vertex Jr 24 microSHIFT
Frame
Bicycle weight	Not informed	9.7 kg	Not informed	Not informed
Drivetrain
Rear sprockets	9	9	10	10
Largest sprocket	42	42	46	42
Lowest gear	13.3 in	13.3 in	14.6 in	16.0 in
Highest gear	50.9 in	50.9 in	61.1 in	61.1 in
Other specifications
Wheel size	20″	20″	24″	24″