Velopedia Bicycle Archive

2003 Specialized Allez Sport 18

Original specifications: Shimano Tiagra drivetrain · 700c wheels · legacy reference geometry.

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At a glance

Model year
2003
Category
Road
Sizes
50cm, 52cm, 54cm, 56cm, 58cm, 61cm
Geometry
Legacy reference
In this record
27 specifications · geometry
Archive ID
30088
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Manufacturer catalog

Published sizes and colors

6 sizes

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

50cm52cm54cm56cm58cm61cm

Frameset

Frame ConstructionTIG-welded
Frame MaterialAluminum, butted
ForkSpecialized C-1
Fork MaterialCarbon fiber composite w/chromoly steerer, unicrown crown

Drivetrain

Component GroupShimano Tiagra
ShiftersShimano Tiagra STI Dual Control
Front DerailleurShimano Tiagra, bottom-pull/clamp-on 31.8mm
Rear DerailleurShimano 105 GS
CranksetSpecialized Comp, 39/53 teeth
Bottom BracketShimano BB-UN25, 110mm spindle
BB Shell Width68mm English
Rear Cogs9-speed, 12 - 25 teeth
ChainShimano CN-HG73, 1/2 x 3/32"
PedalsNot included

Brakes

BrakesAluminum linear-pull brakes, Shimano Tiagra STI Dual Control levers

Cockpit & Contact Points

Headset1 1/8" integrated aluminum
HandlebarSpecialized Pro, 31.8mm
Handlebar ExtensionsNot included
StemSpecialized Pro, 31.8mm
SaddleSpecialized Body Geometry Comp
SeatpostSpecialized carbon fiber, 27.2mm diameter

Wheels & Tires

HubsSpecialized aluminum
RimsAlex AT-400, 32-hole
SpokesDT stainless steel, 14ga. (2.0mm) straight gauge
Spoke NipplesBrass nipples
Front Tire700 x 23c Specialized Turbo Sport
Wheel Size700c wheels

Historical reference geometry

Geometry

Legacy reference · 6 measurements

This historical geometry describes the model, but the original source does not identify its frame size. Use it as a period reference, not a size-specific fit comparison.

MeasurementLegacy reference
Top tube560 mm
Head-tube angle73.5°
Seat-tube angle73.5°
Chainstay / rear center405 mm
Wheelbase980 mm
Fork offset / rake40 mm

The preserved source contains one model-level geometry set without an identified frame size.

Published drivetrain ratios

Gearing

Chainring ÷ rear sprocket

Lower ratios provide more mechanical advantage for climbing. Higher ratios turn the rear wheel farther with each crank revolution.

Published build53/39T · 12–25T · 9-speed
Lowest1.56:1 Highest4.42:1 Total range283%

The bar uses the same mechanical-ratio calculation as Compare. Wheel-dependent speed appears only when the record includes an exact ISO/ETRTO rear tire size; no tire size is assumed.

Parts & serviceability

Find replacement parts

3 top part searches
ChainExact archived part
Shimano CN-HG73, 1/2 x 3/32" Exact archived model
Front tireMatching fit standard
700 x 23c Specialized Turbo Sport Named tire and published size
Brake padsMatching fit standard
Linear-pull brake pads Published brake type — verify pad mounting style
More qualified parts (6)
Bottom bracketExact archived part
Shimano BB-UN25, 110mm spindle Exact archived model
SaddleQualified part search
Specialized Body Geometry Comp Named archived component — verify exact version
CranksetQualified part search
Specialized Comp, 39/53 teeth Named archived component — verify exact version
Rear derailleurMatching configuration
Shimano 105 GS Interpreted as Shimano 105 · 9-speed · mechanical Named component · published drivetrain speed — verify exact version
ShiftersQualified part search
Shimano Tiagra STI Dual Control Interpreted as Shimano Tiagra · 9-speed · mechanical Named component · published drivetrain speed — verify exact version
SeatpostMatching fit standard
27.2 mm seatpost Published diameter — verify length and setback

Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases. Commercial relationships do not influence Archive specifications or analysis.

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Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
0 of 19 checked Progress stays in this browser for this bike.

This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.

Archived: 2003 Specialized Allez Sport 18 · Road/sport · Published sizes: 50cm, 52cm, 54cm, 56cm, 58cm, 61cm

Archived: Frame: TIG-welded · Fork: Specialized C-1 · Carbon fiber composite w/chromoly steerer, unicrown crown

Archived: Group: Shimano Tiagra · Shifters: Shimano Tiagra STI Dual Control · Front derailleur: Shimano Tiagra, bottom-pull/clamp-on 31.8mm · Rear derailleur: Shimano 105 GS · Crankset: Specialized Comp, 39/53 teeth · Bottom bracket: Shimano BB-UN25, 110mm spindle · Rear cogs: 9-speed, 12 - 25 teeth · Chain: Shimano CN-HG73, 1/2 x 3/32"

Archived: Brakes: Aluminum linear-pull brakes, Shimano Tiagra STI Dual Control levers

Archived: Wheel size: 700c wheels · Rims: Alex AT-400, 32-hole · Hubs: Specialized aluminum · Front tire: 700 x 23c Specialized Turbo Sport

Controls and contact points

Archived: Headset: 1 1/8" integrated aluminum · Handlebar: Specialized Pro, 31.8mm · Stem: Specialized Pro, 31.8mm · Seatpost: Specialized carbon fiber, 27.2mm diameter · Saddle: Specialized Body Geometry Comp · Pedals: Not included

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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