Velopedia Bicycle Archive
2026 Argon 18 Nitrogen Pro Shimano Ultegra Di2
Original manufacturer specifications including Shimano Ultegra Di2 drivetrain, 700c wheels, geometry for 6 published sizes.
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What Velopedia knows
- Model year
- 2026
- Category
- Road
- Original MSRP
- $10,499.00
- Sizes
- XXS, XS, S, M, L, XL
- Geometry
- 6 manufacturer sizes · Geometry context
- Record coverage
- 17 preserved details · 2 archived images · original MSRP · preserved geometry
- Archive ID
- 900002263
Frameset
| Frame Construction | Nitrogen Pro |
|---|---|
| Fork | Nitrogen Pro |
Drivetrain
| Component Group | Shimano Ultegra Di2 |
|---|---|
| Shifters | Shimano Ultegra Di2 R8170 |
| Front Derailleur | Shimano Ultegra Di2 R8150 |
| Rear Derailleur | Shimano Ultegra Di2 R8150 |
| Bottom Bracket | CeramicSpeed T47 BB Alpha |
| Cassette | Shimano Ultegra CS-R8100 11-30 |
| Chain | Shimano Ultegra CN-M8100 |
Brakes
| Brakes | Rotors: Shimano Ultegra RT-CL800 / F:160mm R:140mm |
|---|
Cockpit & Contact Points
| Headset | IST3 - CeramicSpeed SLT Bearings |
|---|---|
| Saddle | Repente Quasar CR 2.0 |
| Seatpost | Argon 18 Nitrogen Pro |
Wheels & Tires
| Wheels | ATTEN X Scope Artech 6.A+ |
|---|---|
| Front Tire | Vittoria Corsa Pro TLR 30c |
| Rear Tire | Vittoria Corsa Pro TLR 30c |
| Wheel Size | 700c |
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 | XXS | XS | S | M | L | XL |
|---|---|---|---|---|---|---|
| Seat tube | 395 mm | 425 mm | 460 mm | 505 mm | 550 mm | 595 mm |
| Effective top tube | 502 mm | 519 mm | 537 mm | 557 mm | 578 mm | 601 mm |
| Head tube | 81 mm | 97 mm | 113 mm | 138 mm | 165 mm | 192 mm |
| Head-tube angle | 71.2° | 72.1° | 72.7° | 72.7° | 72.7° | 73° |
| Seat-tube angle | 75° | 74.5° | 74° | 73.5° | 73° | 72.5° |
| Chainstay / rear center | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm |
| Wheelbase | 967 mm | 972 mm | 975 mm | 990 mm | 1006 mm | 1020 mm |
| Bottom-bracket drop | 71 mm | 75 mm | 79 mm | 79 mm | 79 mm | 79 mm |
| Reach | 370 mm | 377 mm | 384 mm | 392 mm | 400 mm | 409 mm |
| Stack | 486 mm | 508 mm | 531 mm | 555 mm | 580 mm | 607 mm |
| Standover height | 682 mm | 706 mm | 734 mm | 772 mm | 810 mm | 848 mm |
| Fork offset / rake | 49 mm | 49 mm | 45 mm | 45 mm | 45 mm | 45 mm |
| Fork length / axle-to-crown | 376 mm | 376 mm | 376 mm | 376 mm | 376 mm | 376 mm |
Geometry source: Argon 18 first-party labeled geometry and fit matrix ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
XXS geometry
Archive context: Its stack of 486 mm sits toward the lower end. The head angle of 71.2° sits toward the steeper end. Its wheelbase of 967 mm sits somewhat shorter than typical.
Compared with 37 distinct road geometries in the XXS-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XXS geometry XS geometry
Archive context: The head angle of 72.1° sits toward the steeper end. Its wheelbase of 972 mm sits toward the shorter end. Its bottom-bracket drop of 75 mm sits somewhat deeper than typical.
Compared with 69 distinct road geometries in the XS-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XS geometry S geometry
Archive context: Its bottom-bracket drop of 79 mm sits toward the deeper-drop end. Its wheelbase of 975 mm sits toward the shorter end. The head angle of 72.7° sits toward the steeper end.
Compared with 93 distinct road geometries in the Small-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze S geometry M geometry
Archive context: Its bottom-bracket drop of 79 mm sits toward the deeper-drop end. Its reach of 392 mm sits somewhat longer than typical. The chainstay of 410 mm sits somewhat shorter than typical.
Compared with 93 distinct road geometries in the Medium-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze M geometry L geometry
Archive context: Its bottom-bracket drop of 79 mm sits toward the deeper-drop end. The seat angle of 73° sits toward the more relaxed end. Its reach of 400 mm sits somewhat longer than typical.
Compared with 82 distinct road geometries in the Large-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze L geometry XL geometry
Archive context: Its bottom-bracket drop of 79 mm sits toward the deeper-drop end. The seat angle of 72.5° sits toward the more relaxed end. Its reach of 409 mm sits somewhat longer than typical.
Compared with 67 distinct road geometries in the XL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XL geometry Parts & serviceability
Find replacement parts
Shimano Ultegra CN-M8100
Exact archived model
Shimano Ultegra CS-R8100 11-30
Exact archived model
Vittoria Corsa Pro TLR 30c
Named tire · verify the exact width
Before ordering: Confirm the exact tire width before ordering.
More qualified parts (3)
Shimano Ultegra Di2 R8150
Component family — verify exact version
Shimano Ultegra Di2 R8150
Component family — verify exact version
Shimano Ultegra Di2 R8170
Component family — verify exact version
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.
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 complete frame and fork in bright light for cracks, dents, distortion, corrosion, impact marks, suspicious paint differences or signs of repair. Check the head tube, bottom-bracket area, dropouts, joints and clamped surfaces especially closely.Inspect the frame and fork →
- BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.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. If it is set up tubeless, confirm both tires hold pressure and ask when the sealant was last refreshed.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 20 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: 2026 Argon 18 Nitrogen Pro Shimano Ultegra Di2 · Road · Published sizes: XXS, XS, S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Nitrogen Pro · Fork: Nitrogen Pro
Drivetrain
Check drivetrain wear →Archived: Group: Shimano Ultegra Di2 · Shifters: Shimano Ultegra Di2 R8170 · Front derailleur: Shimano Ultegra Di2 R8150 · Rear derailleur: Shimano Ultegra Di2 R8150 · Bottom bracket: CeramicSpeed T47 BB Alpha · Cassette: Shimano Ultegra CS-R8100 11-30 · Chain: Shimano Ultegra CN-M8100
Brakes
Inspect the brakes →Archived: Brakes: Rotors: Shimano Ultegra RT-CL800 / F:160mm R:140mm
Wheels and tires
Check wheels and tires →Archived: Wheel size: 700c · Wheels: ATTEN X Scope Artech 6.A+ · Front tire: Vittoria Corsa Pro TLR 30c · Rear tire: Vittoria Corsa Pro TLR 30c
Controls and contact points
Archived: Headset: IST3 - CeramicSpeed SLT Bearings · Seatpost: Argon 18 Nitrogen Pro · Saddle: Repente Quasar CR 2.0
Before and during the test ride
Follow the full used-bike inspection order →Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Gallery
Recently checked marketplace data
Market Snapshot
Velopedia did not find a close used eBay listing in the latest snapshot. New and used listings remain separate.
Evidence standard
Fixed-price and Best Offer item prices only
Shipping and tax excluded
Active asks, not completed sales
No close current matches found. Velopedia did not find an eBay listing confident enough to include in the latest snapshot.
Listings shown have not passed their eBay-supplied end time. Velopedia rechecks matched bicycles on a protected weekly cycle; availability can still change between checks. Price calculations use active fixed-price and Best Offer item prices before shipping and tax. Auction bids, auction-only prices, classified ads, lower-confidence Review candidates and ended listings are excluded. These observations are not completed-sale prices, a certified appraisal or a guarantee of value.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.