Felt IA Advanced Ultegra DI2 vs Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2

Compare Specifications of Felt IA Advanced Ultegra DI2 and Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2

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Felt IA Advanced Ultegra DI2
Felt IA Advanced Ultegra DI2

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Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2
Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2

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Model:

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Technical Specifications
Frame Felt Integrated Aero Tri Disc UHC Advanced + TeXtreme carbon fiber, MMC with Inside Out construction, 68 mm BSA threaded bottom bracket shell, 12 x 142 mm with Syntace style thru axle, flat mount disc brake standard, horizontal dropouts, replaceable rear derailleur hanger, internal mechanical or electronic cable routing S-Works Tarmac SL8 FACT 12r Carbon, Rider First Engineered™, Win Tunnel Engineered, Clean Routing, Threaded BB, 12x142mm thru-axle, flat-mount disc
Stem Felt Dagger 31.8 Cold Forged Roval Rapide Cockpit, Integrated Bar/Stem
Handle Bar Devox Bayonet 3.1 base bar with Devox Ergomod extensions, ¯31.8 mm, 48 - 51 cm: 390 mm, 54 - 58 cm: 420 mm Roval Rapide Cockpit, Integrated Bar/Stem
Fork Felt Dagger Disc UHC Advanced carbon fiber monocoque construction, 1.125" carbon fiber steerer, upper cover, blades, dropouts, crown; internal disc-brake routing, flat-mount disc brake standard, 12 x 100 mm thru axle --
Seatpost Felt VariMount Aero Tri UHC Advanced carbon fiber, 300 mm length S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset
Grip -- Supacaz Super Sticky Kush
Crankset Shimano Ultegra R8000, 52/36T, 48 -51 cm: 165 mm, 54 -56 cm: 170 mm, 58 cm: 172.5 mm Shimano Dura-Ace R9200, HollowTech II, 12-speed with 4iiii Precision Pro dual-sided powermeter
Chain Shimano 11-speed Shimano Dura-Ace, 12-speed
Shifters Shimano Dura-Ace Di2 R9160 (aero extension) with right hand SW-R600 secondary shifter (base bar) --
Saddle ISM PS1.0 Body Geometry S-Works Power, carbon fiber rails, carbon fiber base
Headset FSA integrated, 1.125" 36¡/45¡ sealed ACB cartridge bearings MR122 {873E-RS}, split top race H2145 {No.11AGY-2} with Felt compression device --
Derailleur Front Shimano Ultegra R8050 Di2 braze-on Shimano Dura-Ace R9250, braze-on
Derailleur Rear Shimano Ultegra R8050 Di2 11-speed short cage Shimano Dura-Ace R9250, 12-speed
Hub Front Reynolds Series 1, straight-pull design, 4 pawl, 24T ratchet, 11-speed XDR driver, 12 x 142 mm thru axle, Center Lock --
Hub Rear Reynolds Series 1, straight-pull design, 12 x 100 mm thru axle, Center Lock --
Spoke Sapim Sprint bladed --
Cassette Shimano 11-speed, 11-28T Shimano Dura-Ace, 12-speed, 11-30t
Chainrings -- 52/36T
Bottom Bracket -- Shimano Dura-Ace, BB-R9200
Tyres
Front Continental Grand Sport Race folding, 700 x 25c S-Works Turbo Rapidair 2BR, 700x26mm
Rear Continental Grand Sport Race folding, 700 x 25c S-Works Turbo Rapidair 2BR, 700x26mm
Wheel / RIM Reynolds AR58/62 DB Custom carbon, tubeless ready, 21 mm inner width, 58 mm depth front, 62 mm depth rear Front: Roval Rapide CLX II, Tubeless, 21mm internal width carbon rim, 51mm depth, Win Tunnel Engineered, Roval AFD hub, 18h, DT Swiss Aerolite spokes
Rear: Roval Rapide CLX II, Tubeless, 21mm internal width carbon rim, 60mm depth, Win Tunnel Engineered, Roval AFD hub, 24h, DT Swiss Aerolite spokes
Tube -- Turbo Ultralight, 60mm Front, 80mm Rear, Presta valve
Brakes
Front TRP HD-T910 hydraulic disc, 140 mm rotor Shimano Dura-Ace R9270, hydraulic disc
Rear TRP HD-T910 hydraulic disc, 140 mm rotor Shimano Dura-Ace R9270, hydraulic disc
Brake Lever TRP HD-T910 hydraulic with integrated secondary shift buttons (right lever only) Shimano Dura-Ace R9270, hydraulic disc
Suspension
Front -- S-Works FACT 12r Carbon, 12x100mm thru-axle, flat-mount disc
Rear -- --
Colors Available
Colors Matte TeXtreme (White Geo)
Matte TeXtreme (Spatter, Gloss Charcoal)
Satin Fog Tint / Green Ghost Pearl / Red Ghost Pearl Fade
Satin Carbon / Viavi Cynan Blue / Viavi Silver-Blue Pearl Fade / Gloss Metallic White Silver


Physical Specs
Length -- --
Weight 9.55 kg 6.62 kg
Overview
Features -- --
Additional Details Bar tape : Devox Gel tape and new EVA arm pads with anti-microbial cover
Bottom Bracket : Shimano Hollowtech BSA threaded
Seatpost Clamp : Felt Internaloc integrated with titanium bolts
Thru axle : Front: 12 x 100 x 118, thread: M12 x 1.5P x 13L, Maxle; Rear: 12 x 142 x 163 (163L + 9 head = 172 total), thread: M12 x 1.0P x 19L, Syntace
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Accessories Carbon assembly paste,
Aero seatpost slot covers,
IA CALpac 2.0, Di2 Internal battery charger,
IA BTSpac storage box,
Tubeless valve stems
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Which one do you think is better? And why?
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