Specialized Rockhopper Expert 29er

2011 MountainCross-country Manufacturer page

Wheels: 29″
Drivetrain: 3 × 9 22–44t / 11–34t
Gear range: 618%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

15.5"
17.5"
19"
21"
23"

The manufacturer did not publish rider heights for these sizes.

Components

14 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 M4SL fully manipulated alloy frame, 29"" geometry, fully butted, integrated HT, forged dropouts w/ replaceable derailleur hanger, disc only Not identified

Suspension

1 part

Fork
- RockShox

Drivetrain

7 parts

Bottom bracket
- Shimano BB-ES25
BB-ES25
Cassette
- Shimano CS-HG30 11–34t
CS-HG30
Chain
- KMC X9 9 speeds
Crankset
- Shimano FC-M430-8
FC-M430
Front derailleur
- Shimano
Rear derailleur
- Shimano Deore
Shifters
- Shimano Deore SL-M590
SL-M590

Brakes

2 parts

Brake levers
- Shimano
BR-M505
Brakes
- Shimano
BR-M505

Wheels and tires

5 parts

Front hub

Forged alloy, hi/low flange, double sealed, ground race, machined disc mount and flange, QR, 32h Not identified
Rear hub

Forged alloy, mid flange, double sealed, ground race, machined disc mount and flanges, cassette, QR, 36h 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

Integrated 1-1/8"" threadless, Campy type full cartridge bearings Not identified
Pedals

Alloy 1pc. body and cage, reflector kit, 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

5 sizes Open in the geometry plotter

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

Size 19"

Table

Reach 436mm

Stack 627mm

Wheelbase 1114mm

Head angle 71.0°

Seat angle 73.2°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	402	417	436	455	469
Stackmm	615	618	627	646	664
Top tube lengthmm	576	603	625	650	670
Seat tube lengthmm	394	444	483	533	584
Head tube lengthmm	110	110	120	140	160
Head tube angle	70.5°	71°	71°	71°	71°
Seat tube angle	74.2°	73.2°	73.2°	73.2°	73.2°
Chainstay lengthmm	442	442	442	442	442
Wheelbasemm	1075	1083	1114	1139	1159
Front centermm	644	652	683	707	727
Bottom bracket dropmm	75	75	75	75	75
Bottom bracket heightmm	299.5	299.5	299.5	299.5	299.5
Standover heightmm	710	790	817	853	889
Fork rakemm	44	41	49	49	49
Trailmm	86	86	77	77	77
Stack/reach ratio	1.53	1.48	1.44	1.42	1.42

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: Aluminum

Suspension

Suspension configuration: Hardtail

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 22
Largest chainring: 44
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 18.8 in
Highest gear: 116.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire width: 2″
Travel: Front: Additional specification: Not available: No
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

2 measures

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

Lowest gear

18.8 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

116.0 gear inches

This value is above 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: 7.2 km/h
Highest gear: 44.4 km/h

Total gear range 618%

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: 18.8–116.0 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

Differences across 2011 builds
Specification	This bicycle Specialized Rockhopper Expert 29er	Specialized Rockhopper	Specialized Rockhopper Comp	Specialized Rockhopper Comp 29er	Specialized Rockhopper LTD 29er	Specialized Rockhopper Pro 29er
Frame
Fork material	Aluminum	Steel	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	44	42	44	44	Not informed	44
Rear sprockets	9	8	9	9	10	9
Largest sprocket	34	32	34	34	34	34
Lowest gear	18.8 in	17.9 in	16.8 in	18.8 in	Not informed	18.8 in
Highest gear	116.0 in	99.3 in	104.0 in	116.0 in	Not informed	116.0 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Other specifications
Fork spring	Coil	Not informed	Not informed	Not informed	Air	Air
Wheel size	29″	26″	26″	29″	29″	29″