Velopedia Bicycle Archive
2025 Specialized Aethos Pro
Road bicycle from the Velopedia specification archive.
- Original MSRP
- $6,999.99
- Sizes
- 49; 52; 54; 56; 58; 61
- Colors
- Satin Carbon / Red Pearl / Black; Gloss Champagne / Smoke
- Weight
- 6.78kg (14 lb, 15.2 oz)
- Geometry
- 6 manufacturer sizes
- Archive ID
- 900001037
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What the specifications mean
Electronic shifting removes the usual shift cable but adds a separate battery and controls, while the 273% cassette range describes how much gearing is available. Hydraulic disc brakes shift routine service toward pad and rotor condition, fluid leaks and use of the correct bleed fluid. Carbon construction changes the inspection emphasis from metal-style dents and corrosion to impact damage, ripples and overtightened clamp areas.
Drivetrain
Electronic · 273% range
Shift-system battery state joins derailleur setup and sprocket compatibility as a troubleshooting variable.
Brake service
Hydraulic disc
Pad and rotor condition plus the correct bleed fluid are the primary service checks.
Frame material
Carbon / composite
Look for impact damage and clamp marks rather than metal-style dents or rust.
Bottom bracket
Threaded interface
Shell width, thread standard and crank-spindle interface still require confirmation.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameInspect the frame in bright light, especially around the head tube, bottom bracket, chainstays and clamped areas. Look for cracks, ripples, crushed sections or signs of a previous impact.Inspect the frame and fork →
- BrakesBoth levers should feel firm and return cleanly. Check for fluid around the levers and calipers, inspect pad thickness and contamination, and look for worn or bent rotors.Inspect the brakes →
- DrivetrainConfirm every shift-system battery charges, every shift control works and the derailleur moves cleanly across the cassette. Make sure the matching shift-system charger is included, then measure chain wear and inspect the cassette teeth.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.Check wheels and tires →
- Bottom bracketTurn the cranks slowly, feel for rough bearings and check for side-to-side play. Creaking under load deserves investigation but does not identify the source by itself.Inspect the bottom bracket and shell →
Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
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.
Identity and fit
Follow the full used-bike inspection order →Archived: 2025 Specialized Aethos Pro · Road · Published sizes: 49; 52; 54; 56; 58; 61
Frame and fork
Inspect the frame and fork →Archived: Frame: Aethos FACT 10r Carbon, Rider First Engineered™, Threaded BB, 12x142mm thru-axle, flat-mount disc · Fork: FACT Carbon, 12x100mm thru-axle, flat-mount disc · Carbon Fiber
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano Ultegra Di2 R8170, hydraulic disc · Front derailleur: Shimano Ultegra Di2 R8150, braze-on · Rear derailleur: Shimano Ultegra Di2 R8150, 12-speed · Crankset: Shimano Ultegra R8100 with 4iiiis Precision 3+ Power Meter · Bottom bracket: Shimano Threaded BSA BB · Cassette: Shimano Ultegra, 12-speed, 11-30t · Chain: Shimano M8100, 12-speed w/ quick link
Brakes
Inspect the brakes →Archived: Brakes: (F) Shimano Ultegra R8170, hydraulic disc, 160mm rotor / (R) Shimano Ultegra R8170, hydraulic disc, 140mm rotor
Wheels and tires
Check wheels and tires →Archived: Front tire: S-works Turbo 2BR, 700x28mm · Rear tire: S-works Turbo 2BR, 700x28mm
Controls and contact points
Archived: Handlebar: S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole · Stem: Specialized Pro SL, alloy, 4-bolt · Seatpost: Roval Alpinist Carbon Seatpost · Saddle: Body Geometry Power Pro with Mirror, hollow titanium rails
Before and during the test ride
Follow the full used-bike inspection order →Interpretation based on the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Frameset
| Frame Construction | Aethos FACT 10r Carbon, Rider First Engineered™, Threaded BB, 12x142mm thru-axle, flat-mount disc |
|---|---|
| Frame Material | Carbon Fiber |
| Fork | FACT Carbon, 12x100mm thru-axle, flat-mount disc |
| Fork Material | Carbon Fiber |
Drivetrain
| Shifters | Shimano Ultegra Di2 R8170, hydraulic disc |
|---|---|
| Front Derailleur | Shimano Ultegra Di2 R8150, braze-on |
| Rear Derailleur | Shimano Ultegra Di2 R8150, 12-speed |
| Crankset | Shimano Ultegra R8100 with 4iiiis Precision 3+ Power Meter |
| Bottom Bracket | Shimano Threaded BSA BB |
| Cassette | Shimano Ultegra, 12-speed, 11-30t |
| Chain | Shimano M8100, 12-speed w/ quick link |
Brakes
| Brakes | (F) Shimano Ultegra R8170, hydraulic disc, 160mm rotor / (R) Shimano Ultegra R8170, hydraulic disc, 140mm rotor |
|---|
Cockpit & Contact Points
| Handlebar | S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole |
|---|---|
| Stem | Specialized Pro SL, alloy, 4-bolt |
| Saddle | Body Geometry Power Pro with Mirror, hollow titanium rails |
| Seatpost | Roval Alpinist Carbon Seatpost |
Wheels & Tires
| Wheels | (F) Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, Tubeless Ready / (R) Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, Tubeless Ready |
|---|---|
| Front Tire | S-works Turbo 2BR, 700x28mm |
| Rear Tire | S-works Turbo 2BR, 700x28mm |
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | 49 | 52 | 54 | 56 | 58 | 61 |
|---|---|---|---|---|---|---|
| Seat tube | 431 mm | 462 mm | 481 mm | 504 mm | 532 mm | 567 mm |
| Effective top tube | 508 mm | 531 mm | 540 mm | 562 mm | 577 mm | 595 mm |
| Head tube | 109 mm | 120 mm | 137 mm | 157 mm | 184 mm | 204 mm |
| Head-tube angle | 71.75° | 72.5° | 73° | 73.5° | 73.5° | 74° |
| Seat-tube angle | 75.5° | 74° | 74° | 73.5° | 73.5° | 73° |
| Chainstay / rear center | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm |
| Wheelbase | 973 mm | 975 mm | 978 mm | 991 mm | 1005 mm | 1012 mm |
| Bottom-bracket drop | 74 mm | 74 mm | 72 mm | 72 mm | 72 mm | 72 mm |
| Bottom-bracket height | 266 mm | 266 mm | 268 mm | 268 mm | 268 mm | 268 mm |
| Reach | 375 mm | 380 mm | 384 mm | 395 mm | 402 mm | 408 mm |
| Stack | 514 mm | 527 mm | 544 mm | 565 mm | 591 mm | 612 mm |
| Standover height | 705 mm | 728 mm | 748 mm | 769 mm | 796 mm | 824 mm |
| Fork offset / rake | 47 mm | 47 mm | 44 mm | 44 mm | 44 mm | 44 mm |
| Front center | 574 mm | 577 mm | 579 mm | 591 mm | 606 mm | 613 mm |
| Trail | 63 mm | 58 mm | 58 mm | 55 mm | 55 mm | 52 mm |
| Fork length / axle-to-crown | 369 mm | 369 mm | 369 mm | 369 mm | 369 mm | 369 mm |
| Crank length | 165 mm | 170 mm | 172.5 mm | 172.5 mm | 175 mm | 175 mm |
| Stem length | 80 mm | 90 mm | 100 mm | 100 mm | 110 mm | 110 mm |
| Handlebar width | 380 mm | 400 mm | 420 mm | 420 mm | 440 mm | 440 mm |
Geometry source: Manufacturer HTML geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Gallery
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.