Specialized Rockhopper

2011 MountainCross-country Manufacturer page

Wheels: 26″
Drivetrain: 3 × 8 22–42t / 11–32t
Gear range: 555%
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

13"
15.5"
17.5"
19"
21"
23"

The manufacturer did not publish rider heights for these sizes.

Components

13 of 23 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 M4 fully manipulated alloy frame, fully butted, externally relieved HT, forged dropouts w/ replaceable derailleur hanger, disc only Not identified

Suspension

1 part

Fork
- SR Suntour
DS-26-LO

Drivetrain

7 parts

Bottom bracket
- Shimano BB-ES25
BB-ES25
Cassette
- SRAM PG-830 8 speeds 11–32t
PG-830
Chain
- KMC
Crankset
- SR Suntour
Front derailleur
- Shimano Altus
Rear derailleur
- SRAM
Shifters
- SRAM X4

Brakes

2 parts

Brake levers

Alloy, linear pull Not identified
Brakes
- SRAM G2

Wheels and tires

5 parts

Front hub

Forged alloy, hi/low flange, double sealed, ground race, machined disc mount and flange, QR, 28h Not identified
Rear hub

Forged alloy, mid flange, double sealed, ground race, machined disc mount and flanges, cassette, QR, 32h Not identified
Rims
- Alex Rims
Spokes

2mm (14g) stainless Not identified
Tires
- Specialized

Cockpit and contact points

7 parts

Grips
- Specialized
Handlebar

Butted alloy riserbar, 25mm rise, 8 degree back sweep, 6 degree up Not identified
Headset

1-1/8"" threadless, loose ball Not identified
Pedals

Plastic platform, toe-clip compatible, reflectors, 9/16"" Not identified
Saddle
- Specialized
Seatpost

Alloy two bolt, 12.5mm offset, micro adjust, 30.9mm Not identified
Stem

3D forged alloy, 7 degree rise, 31.8mm clamp Not identified

Sizes and geometry

6 sizes Open in the geometry plotter

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

Size 17.5"

Table

Reach 420mm

Stack 577mm

Wheelbase 1075mm

Head angle 70.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 26″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	377	403	420	436	455	469
Stackmm	549	549	577	587	606	624
Top tube lengthmm	545	571	596	615	640	660
Seat tube lengthmm	330	394	444	483	533	584
Head tube lengthmm	100	100	110	120	140	160
Head tube angle	70°	70°	70°	70°	70°	70°
Seat tube angle	73°	73°	73°	73°	73°	73°
Chainstay lengthmm	426	426	426	426	426	426
Wheelbasemm	1029	1049	1075	1101	1127	1148
Front centermm	606	626	652	678	704	725
Bottom bracket dropmm	39	39	39	39	39	39
Bottom bracket heightmm	304	304	304	304	304	304
Standover heightmm	693	737	777	800	836	872
Fork rakemm	40	34	33	39	39	39
Trailmm	82	89	90	83	83	83
Stack/reach ratio	1.46	1.36	1.37	1.35	1.33	1.33

Not published by the manufacturer: 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
Fork material: Steel

Suspension

Suspension configuration: Hardtail

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 22
Largest chainring: 42
Rear sprockets: 8
Smallest sprocket: 11
Largest sprocket: 32
Lowest gear: 17.9 in
Highest gear: 99.3 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2″
Travel: Front: Additional specification: Not available: No
Wheel material: Aluminum
Wheel size: 26″

Technical analysis

2 measures

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

Lowest gear

17.9 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2011
Sample: 228 bicycles with this information
Coverage: 91.9% of the class

Highest gear

99.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2011
Sample: 228 bicycles with this information
Coverage: 91.9% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.8 km/h
Highest gear: 38.0 km/h

Total gear range 555%

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: 17.9–99.3 gear inches
Class reference (p10–p90): 16.8–116.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2011
Lowest gear: 228 bicycles with this information, 91.9% of the class
Highest gear: 228 bicycles with this information, 91.9% 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 2011 builds
Specification	This bicycle Specialized Rockhopper	Specialized Rockhopper Comp	Specialized Rockhopper Comp 29er	Specialized Rockhopper Expert 29er	Specialized Rockhopper LTD 29er	Specialized Rockhopper Pro 29er
Frame
Fork material	Steel	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum
Drivetrain
Front chainrings	3	3	3	3	Not informed	3
Smallest chainring	22	22	22	22	Not informed	22
Largest chainring	42	44	44	44	Not informed	44
Rear sprockets	8	9	9	9	10	9
Largest sprocket	32	34	34	34	34	34
Lowest gear	17.9 in	16.8 in	18.8 in	18.8 in	Not informed	18.8 in
Highest gear	99.3 in	104.0 in	116.0 in	116.0 in	Not informed	116.0 in
Brakes
Brake type	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Other specifications
Wheel size	26″	26″	29″	29″	29″	29″
Fork spring	Not informed	Not informed	Not informed	Coil	Air	Air

Changes since 2010
Specification	2010 Specialized Rockhopper	This bicycle Specialized Rockhopper
Frame
Fork material	Aluminum	Steel
Suspension
Front travel	100 mm	Not informed
Brakes
Brake type	Rim brake	Mechanical disc
Other specifications
Fork spring	Coil	Not informed