Argon 18 Sum Pro Shimano Dura-Ace Di2 Bike No compromises. Full gas. The Argon 18 Sum Pro is the quiver-killer that refuses to be pigeonholed - equally at home driving a breakaway on a brutal climb, holding position in a fast crit, or drilling it to the line in a bunch sprint. Built on a higher-spec carbon platform than the Sum, the Sum Pro adds a stiffer, more refined chassis tuned specifically for riders who accept nothing short of race-level performance. This Dura-Ace Di2 build pairs Shimano's flagship electronic groupset with a Vision Metron 5D ACR EVO integrated cockpit, Ceramic Speed bottom bracket, and Scope Artech A4 carbon wheels for a complete, race-ready package. Features Sum Pro carbon frame and fork with integrated cable routing, Argon 18's 3D headset technology, and 30c (32mm) tire clearance - a higher-specification platform than the Sum, tuned for maximum race-day performance Shimano Dura-Ace Di2 R9250 electronic drivetrain with Shimano's flagship 12-speed wireless shifting, integrated system charging, and wireless connectivity Shimano Dura-Ace R9200 52/36 crankset with an 11-30 cassette for a race-optimized gear range on climbs and flat-out efforts alike Ceramic Speed BB86 bottom bracket for reduced friction and long-term durability at the heart of the drivetrain Shimano Dura-Ace Di2 R9270 hydraulic disc brakes with Dura-Ace RT-MT900 rotors (160mm front, 140mm rear) for the most powerful, consistent braking in Shimano's road lineup Vision Metron 5D ACR EVO integrated bar/stem - a fully integrated cockpit with improved aerodynamics, enhanced stiffness, and an ultra-low 320g system weight Scope Artech A4 carbon wheelset - 45mm rim depth at just 1, 120g - paired with Challenge Criterium RS TLR 28c tubeless-ready tires for an aero, fast-rolling race setup SPECIFICATIONSFrame Sum Pro Carbon, Integrated Cable Routing, 3D Headset, 30c (32mm) Tire Clearance Fork Sum Pro Specific Carbon Headset FSA Headset NO. 55R 1. 5" + 3DFront Derailleur Shimano Dura-Ace Di2 R9250Rear Derailleur Shimano Dura-Ace Di2 R9250Shifters Shimano Dura-Ace Di2 R9270Crankset Shimano Dura-Ace R9200, 52/36T, 165mm (XXS), 170mm (XS/S), 172. 5mm (M/L), 175mm (XL)Bottom Bracket Ceramic Speed BB86 Shimano Coated Chain Shimano Dura-Ace CN-M9100Cassette Shimano Dura-Ace CS-R9200, 11-30T, 12-Speed Brakes Shimano Dura-Ace Di2 R9270 Hydraulic Disc Rotors Shimano Dura-Ace RT-MT900, F: 160mm / R: 140mm Wheelset Scope Artech A4 Carbon Tires Challenge Criterium RS TLR, 700x28c, Tubeless Ready Tire Clearance30c (32mm)Handlebar Vision Metron 5D ACR EVO Integrated Bar/Stem, 380mm (XXS/XS/S), 400mm (M/L), 420mm (XL)Bar Tape Ciclovation Leather Touch Tornado Gloss Seatpost Sum Pro Specific Carbon Saddle Repente Quasar CR Carbon Rail Intended Use Road, Racing, Climbing, Criterium Note: Components are subject to change without notice. METRICINCHArgon 18 Sum Pro Size XXSXSSmall Medium Large XLA: Seat Tube Length395425460505550595B: Effective Top Tube503520538557578600C: Stack471493516540565592D: Reach375382389397405414F: BB Drop697377777777G: Head Tube Length6985101126152180H: Head Tube Angle71. 2 deg72. 1 deg72. 7 deg72. 7 deg72. 7 deg73. 0 degI: Seat Tube Angle75. 0 deg74. 5 deg74. 0 deg73. 5 deg73. 0 deg72. 5 degJ: Standover Height676700727766804841K: Chainstay Length410410410410410410L: Wheelbase96797297599010061020Suggested Rider Height Frame Size XXSXSSmall Medium Large XLSize Range44-46 cm47-50 cm51-53 cm54-56 cm57-59 cm60-62 cm Argon 18 Sum Pro Size XXSXSSmall Medium Large XLA: Seat Tube Length15. 616. 718. 119. 921. 723. 4B: Effective Top Tube19. 820. 521. 221. 922. 823. 6C: Stack18. 519. 420. 321. 322. 223. 3D: Reach14. 815. 015. 315. 615. 916. 3F: BB Drop2. 72. 93. 03. 03. 03. 0G: Head Tube Length2. 73. 34. 05. 06. 07. 1H: Head Tube Angle71. 2 deg72. 1 deg72. 7 deg72. 7 deg72. 7 deg73. 0 degI: Seat Tube Angle75. 0 deg74. 5 deg74. 0 deg73. 5 deg73. 0 deg72. 5 degJ: Standover Height26. 627. 628. 630. 231. 733. 1K: Chainstay Length16. 116. 116. 116. 116. 116. 1L: Wheelbase38. 138. 338. 439. 039. 640. 2Suggested Rider Height Frame Size XXSXSSmall Medium Large XLSize Range44-46 cm47-50 cm51-53 cm54-56 cm57-59 cm60-62 cm | Argon 18 | Sum Pro Dura-Ace Di2 Bike Crystal Black / Foil Xxs