Specialized Hotrock 20

Name: Specialized Hotrock 20
Brand: Specialized

2021 YouthMountain youth Manufacturer page

Specialized Hotrock 20, color Acid Mint / Black

Last known price: $450

Prices shown first for United States
Fork travel: 40 mm
Wheels: 20″
Drivetrain: 1 × 7 30t / 11–34t
Gear range: 309%
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

8 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

Specialized A1 Premium Aluminum, single-butted, unisex frame, replaceable derailleur hanger Not identified

Suspension

1 part

Fork
- SR Suntour

Drivetrain

5 parts

Cassette
- SunRace 11–34t
Chain
- KMC
Crankset

Forged alloy, square taper, 127mm w/ chainguard, Steel, 30T Not identified
Rear derailleur
- Shimano Tourney TX RD-TX800 8 speeds
RD-TX800
Shifters
- Shimano Tourney

Brakes

1 part

Brakes

Front: V-brake w/ tool-less reach adjust brake lever, Rear: V-brake w/ tool-less reach adjust brake lever Not identified

Wheels and tires

5 parts

Front hub

Alloy, loose ball bearings, bolt type, 32h Not identified
Rear hub
- Shimano Tourney
Rims

20" alloy, 16mm depth, 21mm internal width Not identified
Spokes

Stainless, 14g Not identified
Tires

Front: Renegade, 26 TPI, wire bead, 20x2.1", Rear: Renegade, 26 TPI, wire bead, 20x2.1" Not identified

Cockpit and contact points

6 parts

Grips
- Specialized
Handlebar

Double-butted alloy, 5-degree backsweep, 25.4mm Not identified
Pedals

Nylon platform w/ reflectors Not identified
Saddle
- Specialized
Seatpost

Alloy, single-bolt, 27.2MM Not identified
Stem

20-degree rise, 25.4mm 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 9

Table

Reach 320mm

Stack 448mm

Wheelbase 916mm

Head angle 69.0°

Seat angle 72.0°

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
Frame
Reachmm	320
Stackmm	448
Top tube lengthmm	465
Seat tube lengthmm	279
Head tube lengthmm	110
Head tube angle	69°
Seat tube angle	72°
Chainstay lengthmm	390
Wheelbasemm	916
Front centermm	527
Bottom bracket dropmm	20
Bottom bracket heightmm	183
Standover heightmm	468
Fork rakemm	40
Trailmm	35
Stack/reach ratio	1.40
Suspension and parts
Crank lengthmm	127
Handlebar widthmm	580
Stem lengthmm	70
Seatpost lengthmm	300

Not published by the manufacturer: Front travel, Rear travel, Stem angle and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Hardtail
Front travel: 40 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 7
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 17.7 in
Highest gear: 54.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire width: 2.1″
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

17.7 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2021
Sample: 230 bicycles with this information
Coverage: 72.3% of the class

Highest gear

54.6 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2021
Sample: 230 bicycles with this information
Coverage: 72.3% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.8 km/h
Highest gear: 20.9 km/h

Total gear range 309%

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: 17.7–54.6 gear inches
Class reference (p10–p90): 15.6–80.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2021
Lowest gear: 230 bicycles with this information, 72.3% of the class
Highest gear: 230 bicycles with this information, 72.3% 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 2021 builds
Specification	This bicycle Specialized Hotrock 20	Specialized Hotrock 24
Suspension
Front travel	40 mm	50 mm
Drivetrain
Rear sprockets	7	8
Lowest gear	17.7 in	21.2 in
Highest gear	54.6 in	65.5 in
Other specifications
Wheel size	20″	24″
Bottom bracket standard	Not informed	BSA