Specialized Source Expert Disc

2012 UrbanCommuter Manufacturer page

Fork travel: 52 mm
Wheels: 700c
Drivetrain: 2 × 10 34–48t / 11–32t
Gear range: 411%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

13 of 22 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 E5 aluminum, fully manipulated tubing, smooth weld, compact design, inside rear triangle disc mount, internal cable routing, integrated headset, fender/rack eyelets, center kickstand plate Not identified

Suspension

1 part

Fork

Aluminum legs/crown, Cr-Mo steerer, 52mm fully integrated headset, fender/rack eyelets, internal light cable routing Not identified

Drivetrain

7 parts

Bottom bracket

GXP, external bearing Not identified
Cassette
- SRAM 11–32t
Chain
- KMC X10 10 speeds
Crankset
- FSA Omega 48/34t
Front derailleur
- SRAM Apex 10 speeds
Rear derailleur
- SRAM Apex 10 speeds
Shifters
- SRAM

Brakes

2 parts

Brake levers
- Avid
Brakes
- Avid

Wheels and tires

5 parts

Front hub
- Supernova
Rear hub

Machined disc mount & flanges, double-sealed, ground race, dual lock nuts w/ 19mm contact side Not identified
Rims

DRX300 Disc, alloy double-wall, sleeved, CNC machined, 32h Not identified
Spokes

Stainless, 2mm Not identified
Tires
- Specialized

Cockpit and contact points

6 parts

Handlebar
- Specialized
Headset

1-1/8"" sealed Cr-Mo Campy Style integrated bearings, 15mm alloy cone spacer with 30mm of spacers Not identified
Pedals

Sirrus pedal, nylon body, symmetric alloy cage, low profile bearing system, toe clip capable Not identified
Saddle
- Ritchey Comp
Seatpost

Alloy, 2-bolt forged head, 27.2mm, 350mm Not identified
Stem
- Specialized

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Top tube lengthmm	570	580	600	620
Seat tube lengthmm	440	485	530	570
Head tube lengthmm	150	165	190	225
Head tube angle	71°	71.5°	72°	72°
Seat tube angle	73.25°	73.5°	73°	73°
Chainstay lengthmm	445	445	445	445
Wheelbasemm	1065	1073	1082	1103
Front centermm	629	637	647	667
Bottom bracket dropmm	70	70	70	70
Standover heightmm	750	786	821	859
Fork rakemm	51	51	51	51
Trailmm	67	63	60	60
Suspension and parts
Crank lengthmm	170	175	175	175
Handlebar widthmm	580	580	580	580
Stem lengthmm	90	90	100	100

Not published by the manufacturer: Reach, Stack, Bottom bracket height, Stack/reach ratio, Front travel, Rear travel, 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
Front travel: 52 mm

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 48
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 32
Lowest gear: 30.8 in
Highest gear: 126.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 30c
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

2 measures

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

Lowest gear

30.8 gear inches

This value is within the central range for this class.

Cohort: Urban / Commuter Model year: 2012
Sample: 47 bicycles with this information
Coverage: 71.2% of the class

Highest gear

126.6 gear inches

This value is within the central range for this class.

Cohort: Urban / Commuter Model year: 2012
Sample: 47 bicycles with this information
Coverage: 71.2% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.8 km/h
Highest gear: 48.5 km/h

Total gear range 411%

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: 30.8–126.6 gear inches
Class reference (p10–p90): 21.8–126.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Urban / Commuter Model year: 2012
Lowest gear: 47 bicycles with this information, 71.2% of the class
Highest gear: 47 bicycles with this information, 71.2% 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 2012 builds

Differences across 2012 builds
Specification	This bicycle Specialized Source Expert Disc	Specialized Source Eleven
Drivetrain
Front chainrings	2	1
Smallest chainring	34	55
Largest chainring	48	55
Rear sprockets	10	1
Smallest sprocket	11	Not informed
Largest sprocket	32	Not informed
Lowest gear	30.8 in	Not informed
Highest gear	126.6 in	Not informed
Drivetrain technologies	Not informed	belt-drive, internally-geared-hub
Other specifications
Bottom bracket standard	Not informed	EBB